Baked Spinach Ricotta Chicken

Name: Baked Spinach Ricotta Chicken
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American, Italian
Ingredients: 1 tablespoon olive oil; 1 small onion (diced); 4 to 5 cloves garlic (minced); 5 ounces fresh, chopped spinach; kosher salt, pepper, Italian seasoning, crushed red pepper flakes; 1 cup ricotta cheese; 1 1/2 cups marinara sauce; 3 to 4 chicken breasts; 1 cup shredded mozzarella cheese; Optional: parsley for garnish, serve with garlic bread, pasta, or zucchini noodles