This casserole is one of those weeknight heroes: simple to assemble, forgiving, and light enough that you can enjoy seconds without regret. It layers tender shredded chicken with a tangy yogurt-salsa mix and corn tortillas, then bakes until bubbling and slightly browned on top. No heavy creams, no frying—just straightforward flavors and a satisfying finish.

I like to make this when I have a leftover roasted chicken or a few cooked breasts in the fridge. It reheats well and travels nicely, so it’s perfect for feeding a family or bringing to a potluck. The reduced-fat cheddar keeps the gooey factor while keeping calories in check.

What Goes In

Ingredients

1 cup Greek yogurt (fat-free) — adds creaminess and tang while keeping the dish light.
1/2 cup skim milk — thins the yogurt so the filling spreads easily and bakes to a creamy consistency.
1 cup salsa (sugar-free) — provides spice, acidity, and seasoning without extra sugars; choose a style you like.
3 cups chicken, cooked, shredded (from about 1 pound chicken breasts) — the main protein; shredded works best for even layering.
1 cup corn kernels (frozen) — sweet pop and texture; thaw and drain before using to prevent excess moisture.
1 red bell pepper, medium, diced — adds freshness, color, and a mild crunch.
1 cup cheddar cheese, reduced-fat, shredded — for topping and a bit mixed in; provides melty flavor without a heavy fat load.
12 corn tortillas, 6 inch — the layering element that soaks up the filling and crisps at the edges; corn keeps it gluten-free if your tortillas are certified.

Build Skinny Chicken Tortilla Casserole Step by Step

Preheat the oven to 350°F (175°C). Spray a 13×9-inch casserole dish with nonstick spray and set aside.
Thaw the frozen corn and drain well (microwave 30–60 seconds or run under cold water until thawed, then drain).
In a medium bowl, whisk together the Greek yogurt, skim milk, and salsa until smooth.
Add the shredded chicken, drained corn, diced red bell pepper, and half of the shredded cheddar cheese to the yogurt mixture; stir until evenly combined. Reserve the remaining cheese.
Arrange 4 of the 6-inch corn tortillas in a single layer on the bottom of the prepared casserole dish, overlapping as needed to cover the base.
Spread 1/3 of the chicken mixture evenly over the first tortilla layer.
Place 4 more tortillas in a single layer over the filling.
Spread a second 1/3 of the chicken mixture evenly over the second tortilla layer.
Place the last 4 tortillas in a single layer over that filling.
Spread the remaining 1/3 of the chicken mixture evenly over the top tortillas, then sprinkle the reserved shredded cheddar evenly over the top.
Cover the casserole with aluminum foil and bake for 30 minutes, until the filling is hot and bubbly.
Remove the foil and bake an additional 10 minutes, until the cheese is lightly browned.
Let the casserole rest for 10 minutes before slicing and serving.

Why You’ll Love This Recipe

This casserole hits comforting texture and flavor notes without relying on heavy ingredients. The Greek yogurt-salsa mixture gives you creaminess plus zip, and the corn tortillas keep each layer distinct while absorbing flavor. It’s an all-in-one dish: protein, veg, starch, and a little cheese—no separate sides required.

It’s practical, too. Prep is quick, assembly is almost like building a lasagna, and the bake time means you can do other things while dinner cooks. If you’re into batch cooking, it scales and stores well, so you can have easy lunches for several days.

Smart Substitutions

Yogurt — if you don’t have fat-free Greek yogurt, plain low-fat yogurt works, but the filling will be slightly looser. Strain it briefly if needed.
Milk — swap skim milk for unsweetened almond milk to reduce dairy further; the texture will be a touch thinner.
Salsa — use a fire-roasted or chunkier salsa for more texture; a mild salsa keeps heat down if you’re serving kids.
Chicken — rotisserie chicken or leftover roasted chicken are perfect. For a vegetarian option, substitute cooked shredded jackfruit or extra beans (note: beans will change the texture).
Corn — canned whole-kernel corn, drained, works fine if you thawed frozen corn isn’t available.
Tortillas — flour tortillas can be used if you prefer softer layers, but they’ll absorb more moisture and change the calorie profile.
Cheese — use a sharper cheddar to get more flavor with less cheese, or try a Mexican blend for a different profile.

Setup & Equipment

13×9-inch casserole dish — the recipe is written for this size; it yields even layers and a good bake.
Nonstick spray or a little oil — prevents sticking and makes cleanup easier.
Medium mixing bowl and whisk — for the yogurt-milk-salsa mixture.
Measuring cups — to keep proportions correct.
Aluminum foil — for covering while it bakes to trap steam and cook the filling through.
Sharp knife and cutting board — to dice the pepper and slice the finished casserole.

Don’t Do This

Don’t skip draining the corn. Excess moisture will make the casserole soggy and prevent a good set. Also, avoid piling uncooked chicken or very wet ingredients into the filling; use fully cooked, shredded chicken.

Don’t skip the 10-minute resting time after baking. Slicing too soon causes the layers to fall apart and releases all the hot steam—let it settle and firm up a bit for cleaner slices.

Fit It to Your Goals

If you’re watching calories, this recipe already leans light: fat-free Greek yogurt and reduced-fat cheese keep the richness down. To make it higher in protein, use extra chicken or add a layer of white beans mixed into the filling. If you want more veggies, stir in chopped spinach, zucchini, or black beans—just be mindful of added moisture and drain extras.

For a lower-carb take, you can cut the number of tortillas and increase the chicken-veg filling, serving smaller portions over a salad or with roasted vegetables.

Cook’s Commentary

I make this casserole at least once a month. It’s forgiving and travels well, so it’s my go-to for nights when I need a hands-off oven dinner. I usually prep the filling in the morning, refrigerate it, then assemble and bake in the evening. The flavor develops a touch overnight, and it rewarms beautifully.

One tweak I like: briefly toast the tortillas in a dry skillet to reduce their water content and add a toasty flavor. It’s optional, but it creates slightly firmer layers. Also, if you prefer crisp edges, remove the foil for the last 5 minutes instead of 10 and broil very briefly—watch it closely so the cheese doesn’t burn.

Cooling, Storing & Rewarming

Cool the casserole to room temperature, then cover and refrigerate for up to 3–4 days. For freezing, wrap tightly in plastic film and foil and freeze up to 2 months. Thaw overnight in the fridge before reheating.

To reheat: warm individual slices in the microwave for 60–90 seconds, or place the whole dish in a 325°F (160°C) oven, covered, until heated through—about 20–30 minutes for a refrigerated casserole. If reheating from frozen, allow extra time and tent with foil to prevent the top from over-browning.

Reader Q&A

Q: Can I make this ahead?
A: Yes. Assemble the casserole, cover tightly, and refrigerate for up to 24 hours before baking. If baking from cold, add about 5–10 minutes to the covered bake time to ensure it’s hot and bubbly in the center.

Q: My filling seemed watery after baking. Why?
A: Likely too much moisture from the corn, salsa, or unthawed ingredients. Make sure frozen corn is thawed and well drained and that your salsa is not unusually watery. Slightly thicker yogurt or a quick squeeze in a fine sieve can help.

Q: Can I double the recipe?
A: You can, but use two 13×9 pans or a larger pan and increase baking time slightly. Check until the center is hot and bubbly; a larger mass will need more time to heat through.

Wrap-Up

This Skinny Chicken Tortilla Casserole is practical, family-friendly, and adaptable. It combines bright salsa, creamy yogurt, tender chicken, and just enough cheese to satisfy without weighing you down. Make it for busy weeknights, pack it for lunches, or keep it in rotation for a simple crowd-pleaser. If you try a substitution or have a question about reheating, tell me how it went—I love hearing what tweaks work for you.

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