Step 1: Prepare the Chicken
Season chicken breasts with salt, pepper, and Italian seasoning on both sides. This locks in flavor and keeps the chicken juicy as it cooks.

Step 2: Layer the Sauce
Spread 1 cup of marinara sauce on the bottom of the crockpot. This prevents sticking and adds a rich base flavor.

Step 3: Add the Chicken
Place the seasoned chicken in a single layer over the sauce. Avoid overlapping to ensure even cooking.

Step 4: Add Remaining Sauce and Seasonings
Pour the remaining 2 cups of marinara sauce over the chicken. Add minced garlic, basil, oregano, and red pepper flakes. These will infuse the sauce as it simmers.

Step 5: Slow Cook
Cover and cook on Low for 5–6 hours or High for 2½–3 hours until the chicken is tender and easily shredded with a fork.
Tip: Keep the lid closed during cooking to maintain heat.

Step 6: Add the Cheese
About 15–20 minutes before serving, sprinkle mozzarella, Parmesan, and provolone over the chicken. Cover again until the cheese melts and becomes bubbly.

Step 7: Make the Crispy Topping
While the cheese melts, toast breadcrumbs with melted butter in a small skillet for 2–3 minutes until golden. This adds the traditional Chicken Parmesan crunch.

Step 8: Serve and Garnish
Serve chicken over spaghetti or zucchini noodles. Top with toasted breadcrumbs, fresh basil, and extra Parmesan for a restaurant-style finish.