Preheat oven to 400°F and line a baking sheet with parchment paper.
Butterfly the chicken breast or pound it to an even half-inch thickness to ensure even cooking.
In a shallow bowl, whisk the egg; in another bowl, combine almond flour, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then coat thoroughly with the seasoned almond flour mixture.
Heat olive oil in an oven-safe skillet over medium-high heat and sear the chicken for 3 minutes per side until golden.
Top the seared chicken with marinara sauce, mozzarella, and parmesan cheese.
Transfer the skillet to the oven and bake for 8-10 minutes until the chicken is cooked through and the cheese is bubbly.
While the chicken bakes, lightly sauté the zucchini noodles in a separate pan for 2 minutes until just tender.
Serve the crispy chicken over the zucchini noodles and garnish with fresh basil.