Preheat oven to 400°F (200°C). Lightly grease a baking dish or line with parchment paper.
Prepare the chicken: Flatten each chicken breast to an even ½-inch thickness. Season both sides with salt, pepper, garlic powder, and paprika.
Sear the chicken: In a skillet, heat olive oil over medium heat. Sear the chicken for 4–5 minutes per side until golden but not fully cooked. Transfer to the baking dish.
Add creamy layer: In a small bowl, mix ranch dressing and shredded mozzarella. Spread evenly over each chicken breast.
Make the Parmesan crust: In another bowl, combine Parmesan, panko, melted butter, Italian seasoning, minced garlic, and red pepper flakes. Mix well.
Top and bake: Press the Parmesan crust mixture over the creamy layer on each piece of chicken. Bake for 10–12 minutes or until the crust is golden and the internal temperature reaches 165°F (74°C).
Serve: Let rest for a few minutes before serving. Pair with mashed potatoes, vegetables, or salad.