Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Place the chicken breast between two sheets of plastic wrap and pound to an even half-inch thickness.
In a shallow dish, combine the almond flour, grated parmesan, garlic powder, oregano, sea salt, and black pepper.
Place the whisked egg in a separate shallow bowl.
Dip the chicken breast into the egg, allowing any excess to drip off, then dredge it through the almond flour mixture until thoroughly coated.
Place the breaded chicken on the prepared baking sheet and bake for 12 to 15 minutes.
Remove from the oven, spoon the marinara sauce over the chicken, and sprinkle with the shredded mozzarella.
Return to the oven for an additional 5 minutes, or until the cheese is melted and bubbly.
While the chicken finishes, steam the broccoli florets until tender-crisp, then toss with olive oil and a pinch of salt.
Serve the crispy chicken parmesan immediately alongside the steamed broccoli.