Prep the oven and pan: Preheat oven to 400°F (200°C). Lightly grease a 9x13-inch baking dish or line with parchment for easy cleanup.
Flatten the chicken: Place chicken breasts between two sheets of parchment and pound to an even 1/2–3/4 inch thickness.
This helps them cook evenly and stay juicy.
Season the coating: In a shallow bowl, mix almond flour, grated Parmesan, Italian seasoning, garlic powder, onion powder, salt, and pepper.
Egg wash: In another bowl, whisk the eggs until smooth.
Coat the chicken: Dip each chicken breast in the egg, let excess drip off, then press into the almond flour mixture to coat on both sides. Place in the baking dish. Drizzle lightly with olive oil to help it crisp.
Bake the chicken: Bake uncovered for 15–18 minutes, or until the coating starts to brown and the chicken is almost cooked through.
Add sauce and cheese: Spoon marinara evenly over each piece.
Top with shredded mozzarella. Return to the oven and bake another 8–10 minutes, until cheese is melted and bubbly and chicken reaches 165°F (74°C) internally.
Broil for extra color (optional): Broil on high for 1–2 minutes to brown the cheese lightly. Watch closely to avoid burning.
Finish and serve: Rest 5 minutes.
Garnish with chopped basil and a pinch of red pepper flakes if you like heat. Serve with zucchini noodles, roasted broccoli, or a simple green salad.