Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the chicken breast between two pieces of parchment paper and pound with a meat mallet until it reaches an even 1/2-inch thickness.
In a shallow bowl, whisk the egg white until slightly frothy. In a second shallow bowl, combine the almond flour, parmesan cheese, sea salt, black pepper, oregano, and garlic powder.
Spread the broccoli florets on the prepared baking sheet, mist lightly with water or a tiny bit of oil, and roast for 15-20 minutes until the edges are crisp.
Dip the chicken breast into the egg white, letting any excess drip off, then press firmly into the parmesan-almond mixture until thoroughly coated on both sides.
Heat the olive oil in a non-stick skillet over medium heat. Add the chicken and cook for 4-5 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken finishes, warm the marinara sauce in a small saucepan over low heat.
Plate the crispy chicken, spoon the warm marinara over the top, and serve immediately with the roasted broccoli.