Start by cooking the chicken if you’re using fresh breasts. Season them with salt, pepper, and a sprinkle of Italian seasoning. Cook them in a skillet over medium heat until fully cooked. If you’re using frozen chicken, you can bake them according to the package instructions. Once cooked, shred the chicken using two forks.
In a large bowl, combine the shredded chicken, spaghetti sauce, minced garlic, and Italian seasoning. Stir until everything is evenly coated.
Preheat your oven to 350°F (175°C). Slice the slider buns in half without separating them entirely. Place the bottom halves in a large baking dish. Spoon the chicken and sauce mixture evenly over the buns, then sprinkle with shredded mozzarella cheese.
Place the top halves of the slider buns over the cheese. In a small mixing bowl, melt the butter and mix in the garlic powder and Italian seasoning. Brush this flavorful mixture over the top of the slider buns, then sprinkle with grated parmesan cheese.
Cover the baking dish with foil and bake for 15 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and the tops of the buns are golden brown.
Once baked to perfection, remove the sliders from the oven and let them cool for a few minutes. Slice them apart and serve warm.