Butterfly the chicken breast by slicing it horizontally to ensure even cooking and a faster sear.
Whisk the egg in a shallow bowl until the yolk and white are fully combined.
In a separate shallow dish, mix the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dredge the chicken breast in the egg wash, then press firmly into the almond-parmesan mixture to coat both sides thoroughly.
Heat the olive oil in a non-stick skillet over medium heat.
Place the chicken in the skillet and sear for 5-7 minutes per side until the crust is golden brown and the internal temperature reaches 165°F.
While the chicken rests, warm the marinara sauce in a small saucepan over low heat until simmering.
Quickly sauté the zucchini noodles in the same skillet used for the chicken for 2 minutes until just tender.
Serve the crispy chicken over the zucchini noodles and top with the warm marinara sauce.