Preheat to 375°F (190°C) to ensure the dish cooks evenly.
In a mixing bowl, place chicken breasts, add garlic, paprika, oregano, salt, pepper, and drizzle olive oil. Toss until the chicken is evenly coated.
Slice red, yellow, and green bell peppers thinly and add to the bowl with the chicken. Toss to coat the peppers with the seasonings.
Arrange the chicken and pepper mixture evenly in a 9x13-inch casserole dish.
Evenly sprinkle shredded cheddar and Parmesan cheese over the chicken and peppers.
Bake in the preheated oven for 25-30 minutes until the chicken reaches an internal temperature of 165°F (74°C) and the cheese is melted and golden.
Once out of the oven, sprinkle fresh parsley on top. Serve warm and enjoy.
Notes
This recipe adapts easily: use different cheeses or add vegetables such as zucchini or mushrooms. Refrigerate leftovers within 2 hours and eat within 3 to 4 days; reheat to 165°F.