Preheat oven to 375°F (190°C) and oil or grease a 9x13-inch or 2-quart casserole dish. Set aside.

Add chicken breasts, avocado oil, ½ teaspoon salt, black pepper, garlic powder, and paprika in a large mixing bowl. Toss the chicken until it is coated in the oil and spices.

Sear the chicken for 2-3 minutes on each side in a large skillet over medium-high heat. Remove from heat and set aside.

Mix the cream cheese, sour cream, crushed or minced garlic, and ½ teaspoon of the remaining salt in a medium bowl until smooth.

Layer all the spinach on the bottom of the prepared casserole dish.

Using ⅓ of the cream cheese mixture, add small spoonfuls and dot them across the top of the spinach.

Place the seared chicken on top of the cream cheese layer. Add the remaining cream cheese mixture to the chicken and spread it around.

Sprinkle all the mozzarella cheese over the top of the casserole.

Bake for 25-35 minutes, until the chicken is cooked and the cheese starts to brown around the edges of the casserole. Remove from the oven and serve.