Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Place the chicken breast between two pieces of plastic wrap and pound to an even half-inch thickness.
In a shallow bowl, whisk the egg white until frothy.
In a separate shallow bowl, combine the almond flour, dried oregano, garlic powder, sea salt, and black pepper.
Dip the chicken into the egg white, then dredge in the almond flour mixture, pressing to ensure the coating adheres.
Place the breaded chicken on one side of the baking sheet and the broccoli florets on the other side.
Drizzle the olive oil over the broccoli and toss to coat evenly.
Bake for 15 minutes, then remove the tray from the oven.
Spoon the marinara sauce over the chicken and top with the mozzarella and parmesan cheeses.
Return to the oven for 5 to 7 minutes until the chicken is cooked through and the cheese is bubbly and golden.