If you love bold, spicy food but don’t want to fuss over the stove, this Instant Pot Cajun Shrimp is for you. It’s a quick, flavor-forward dinner that comes together with a handful of ingredients and a few minutes under pressure. The shrimp stay juicy, the peppers keep a little snap, and the Cajun seasoning does the heavy lifting for flavor.
I make this on busy weeknights and whenever I need something fast that still tastes like I cared. There’s no long marinating, no babysitting a pan, and cleanup is easy—win-win. I’ll walk you through exactly what to do, why each step matters, and the simple swaps that keep the dish flexible.
The directions are straightforward and written for a pressure cooker. Read through once, prep your ingredients, and you’ll be surprised how quickly dinner arrives to the table.
Gather These Ingredients
Ingredients
- 1 tablespoon vegetable oil — used for sautéing; avocado, sunflower, or corn oil are fine alternatives noted in the recipe source.
- 1 small yellow onion, diced — builds the aromatic base and sweetness.
- 2 cloves garlic, minced — adds immediate savory fragrance; don’t let it burn while sautéing.
- 1 pound (450 grams) raw shrimp — the star protein; quick-cooking so follow the timing closely.
- 2 tablespoons Cajun seasoning — provides the main spice and seasoning profile.
- ¼ teaspoon chili flakes — optional; adds extra heat if you want it.
- ¾ teaspoon salt — balances and brings out flavors.
- 3 small bell peppers, diced (yellow, green, and red) — color and texture contrasts; diced small so they cook quickly.
- ¼ cup vegetable stock — deglazes the pot and creates a little cooking liquid; chicken stock is an acceptable alternative listed in the source.
- chopped fresh parsley — or cilantro; for bright garnish and fresh finish.
Instant Pot Cajun Shrimp: Step-by-Step Guide
- Press SAUTE on the Instant Pot and wait until the display indicates HOT (about 1 minute). Add 1 tablespoon vegetable oil.
- Add the 1 small diced yellow onion and cook, stirring occasionally, until soft and translucent (about 3–4 minutes).
- Add the 2 cloves minced garlic and cook about 30 seconds, until fragrant.
- Press CANCEL to stop SAUTE. Pour in 1/4 cup vegetable stock and scrape the bottom of the pot with a wooden spoon to deglaze and lift any browned bits.
- Add the 3 diced small bell peppers, 1 pound raw shrimp, 2 tablespoons Cajun seasoning, 1/4 teaspoon chili flakes (optional), and 3/4 teaspoon salt. Stir gently to combine.
- Secure the lid and set the vent to SEALING. Select PRESSURE COOK/MANUAL on HIGH pressure and set the time to 0 minutes.
- When the cooking program finishes, perform a quick release by carefully turning the vent to VENTING. Wait until the steam is fully released and the float valve drops.
- Open the lid away from your face, stir once, garnish with chopped fresh parsley or cilantro, and serve warm (for example, over rice).
Why Instant Pot Cajun Shrimp is Worth Your Time
This recipe hits the sweet spot between speed and flavor. Shrimp cook almost instantly, and the Instant Pot lets you seal in bright, concentrated flavors from the peppers, onions, garlic, and Cajun spice. Using the sauté function first builds a little caramelization for depth, which you wouldn’t get if you simply dumped everything in cold.
It’s low-effort but not low-impact. Two tablespoons of Cajun seasoning deliver bold seasoning without needing a dozen pantry items. The quick pressure cook means shrimp go from raw to perfectly textured in minutes, and because the cook time is effectively zero on the pressure setting, you avoid the dread of overcooked rubbery shrimp.
Cleanup is another reason this recipe is a keeper. One pot, minimal splatter, and a fast switch from stovetop to pressure cooking. That’s precisely why this has become a weekday favorite in my house.
Smart Substitutions
If you don’t have something listed, here are safe swaps that won’t derail the dish and are consistent with the recipe’s source notes.
- Vegetable stock — swap with chicken stock (both are listed options); either will deglaze and add a little savory body.
- Vegetable oil — use avocado, sunflower, or corn oil as the recipe suggests. These neutral oils handle sautéing without changing flavor.
- Fresh parsley — cilantro is offered in the ingredient list; both bring freshness at the end. Choose based on preference.
- Chili flakes — optional as noted. If you prefer no extra heat, omit them entirely; the Cajun seasoning still provides spice.
Gear Up: What to Grab
You don’t need fancy tools. Here’s what I pull together before I start:
- Instant Pot (or any electric pressure cooker with a sauté function).
- Sharp knife and cutting board for dicing onion and peppers.
- Wooden spoon or spatula — the recipe specifically calls for a wooden spoon to scrape and deglaze the pot.
- Measuring spoons and a 1/4-cup measure for stock.
- Bowl for chopped parsley/cilantro if you like a tidy garnish station.
Having these at hand reduces last-minute scrambles and keeps the cooking rhythm smooth.
Pitfalls & How to Prevent Them
Overcooking Shrimp
Shrimp are delicate. The trick here is that the Instant Pot solution uses a pressure cook time of zero minutes. That sounds odd, but it’s intentional: the pressure and quick release deliver hot, perfectly cooked shrimp without sitting under heat. Don’t extend time. If you’re unsure whether your machine needs adjustments, follow the recipe exactly the first time.
Burn Notice from the Bottom
If you skip deglazing, you may trigger a burn message when pressure cooking. After sautéing the onion/garlic and any bits stuck to the pot, add the 1/4 cup vegetable stock and scrape the bottom thoroughly. That step prevents scorch alerts and improves flavor.
Too Salty or Too Spicy
Start with the listed 3/4 teaspoon salt and 2 tablespoons of Cajun seasoning. Taste-adjusting isn’t possible after pressure cooking without diluting, so measure carefully. If you’re cautious about heat, omit the optional chili flakes the first time.
Fresh Takes Through the Year
Spring: Keep it bright. Use a heavier hand with the parsley or cilantro and serve over a bed of lightly buttered rice or quick-cooked quinoa for a fresher plate.
Summer: The bell peppers are at their peak—use colorful sweet ones as listed. Skip chili flakes if peppers are sweet and let the natural pepper flavor shine. Serve with a wedge of lemon if you want a citrusy lift.
Fall/Winter: Increase the cozy factor by serving the Cajun shrimp over warm, buttery grits or creamy polenta. The spice meets the creamy base beautifully. Remember, these bases are not in the ingredient list; they’re serving ideas mentioned in passing in the recipe directions.
Notes on Ingredients
Every ingredient here pulls a simple job. The oil facilitates even sautéing. Onion and garlic form the aromatic backbone. Bell peppers contribute texture and color; dice them small so they cook quickly and evenly under short pressure. The shrimp must be raw at the start so the short pressure exposure finishes them perfectly rather than reheating already cooked shrimp.
Cajun seasoning is the central flavor agent—pick a blend you like, or a brand you trust. The recipe’s salt quantity is modest; seasonal taste and seasoning intensity can vary, so keep that in mind if your Cajun blend already contains salt.
Best Ways to Store
Refrigerator: Transfer leftovers to an airtight container and refrigerate for up to 2 days. Shrimp texture changes with time; it’s still tasty, but best eaten within that short window.
Freezing: I don’t recommend freezing the finished dish—the shrimp texture suffers after freezing and reheating. If you must, freeze the shrimp and sauce separately in a shallow container, and plan to use it within a month. Thaw overnight in the refrigerator and reheat gently.
Reheating: Warm gently over low heat on the stovetop or in a microwave in short bursts. Avoid high heat. If the sauce has thickened, add a splash of stock or water to loosen it.
Reader Questions
Q: Can I use frozen shrimp?
A: The recipe’s directions list 1 pound raw shrimp and assume they start thawed. If your shrimp are frozen, thaw them first for even cooking. Using frozen shrimp straight into the pot may lead to uneven doneness because the timing and pressure behaviour will change.
Q: What if my Instant Pot shows a burn message?
A: Follow step 4 closely: press CANCEL after sautéing, add the 1/4 cup vegetable stock, and scrape the bottom with a wooden spoon to lift any browned bits. That deglazing step is the best preventative. If a burn message appears, release pressure, open, deglaze again, and retry.
Q: Can I add other vegetables?
A: The recipe uses three small bell peppers and onion for quick, even cooking. If you add denser veg (like carrots or potatoes), they’ll need longer to soften. You can precook them in the sauté stage or cut them very small, but those aren’t listed in the original ingredient set.
Serve & Enjoy
Finish with a generous sprinkle of chopped parsley or cilantro to bring light, herbal contrast to the spicy, savory shrimp. Serve warm—over rice is my go-to, as noted in the directions, because it soaks up the flavorful juices. If you keep it low-carb, serve it over cauliflower rice or a bed of greens.
One-pot, speedy, and satisfying: that’s the Instant Pot Cajun Shrimp promise. It’s a recipe I return to because it’s reliable, forgiving, and downright tasty. Try it once as written, then make small adjustments—more herbs, less heat, different oil—until it’s your weeknight favorite.
Instant Pot Cajun Shrimp
Ingredients
Ingredients
- ?1 tablespoonvegetable oilor avocado sunflower, corn oil…
- ?1 smallyellow oniondiced
- ?2 clovesgarlicminced
- ?1 pound 450 gramsraw shrimp
- ?2 tablespoonscajun seasoning
- ?1/4 teaspoonchili flakesoptional
- ?3/4 teaspoonsalt
- ?3 smallbell peppersdiced yellow, green, and red
- ?1/4 cupvegetable stockor chicken stock
- ?chopped fresh parsleyor cilantro
Instructions
Instructions
- Press SAUTE on the Instant Pot and wait until the display indicates HOT (about 1 minute). Add 1 tablespoon vegetable oil.
- Add the 1 small diced yellow onion and cook, stirring occasionally, until soft and translucent (about 3–4 minutes).
- Add the 2 cloves minced garlic and cook about 30 seconds, until fragrant.
- Press CANCEL to stop SAUTE. Pour in 1/4 cup vegetable stock and scrape the bottom of the pot with a wooden spoon to deglaze and lift any browned bits.
- Add the 3 diced small bell peppers, 1 pound raw shrimp, 2 tablespoons Cajun seasoning, 1/4 teaspoon chili flakes (optional), and 3/4 teaspoon salt. Stir gently to combine.
- Secure the lid and set the vent to SEALING. Select PRESSURE COOK/MANUAL on HIGH pressure and set the time to 0 minutes.
- When the cooking program finishes, perform a quick release by carefully turning the vent to VENTING. Wait until the steam is fully released and the float valve drops.
- Open the lid away from your face, stir once, garnish with chopped fresh parsley or cilantro, and serve warm (for example, over rice).
Equipment
- Instant Pot
Notes
If you use frozen shrimp, the pressure cooker will take longer to come to pressure as the shrimp defrost and that means that the peppers will be cooked for longer and can result in mushy peppers. I strongly recommend using fresh shrimp or thawing the shrimp before cooking.
If cooking for children, you might want to use a different seasoning as cajun can be too spicy for them. Use smoked paprika, cumin, oregano, salt, and pepper.
