Preheat oven to 400F.
Prepare your chicken by butterflying each breast, cutting about 4 inches through but not all the way through so it is still one big piece.
In a small bowl, combine the oil, salt, pepper, garlic powder, and red pepper flakes and set aside.
In a large bowl, combine ricotta, mozzarella, parmesan, garlic, salt, pepper, and oregano. Stir in wilted spinach until all combined.
Add about 1/4 the mixture to the inside of each chicken breast and then close it shut. If necessary, use a couple toothpicks to hold both sides of the chicken breast together.
Coat the outside of the chicken with the oil/spice mixture.
Heat a large pan with 1 tbsp oil over medium-high heat and sear chicken 3 minutes each side.
Stick pan directly in oven and bake for 10-12 minutes or until internal temp reaches 165F.