Butterfly the chicken breast by slicing it horizontally to ensure even and quick cooking.
In a shallow bowl, whisk together the grated parmesan, almond flour, oregano, garlic powder, sea salt, and black pepper.
Press each side of the chicken firmly into the parmesan mixture until the surface is thoroughly coated with the breading.
Heat the olive oil in a large non-stick skillet over medium heat until shimmering.
Add the chicken to the pan and cook for 5 to 6 minutes per side until the crust is golden brown and the meat is opaque throughout.
While the chicken rests, add the sliced or spiralized zucchini to the same skillet and sauté for 2 to 3 minutes until just tender.
Warm the marinara sauce in a small saucepan over low heat until it begins to simmer.
Spread the warm marinara on a plate, top with the sautéed zucchini, and place the crispy chicken breast on top to serve.