Slice the zucchini into thin half-moon shapes and set aside.
Whisk the egg in a shallow bowl until the yolk and white are fully combined.
In a separate shallow dish, mix together the almond flour, grated parmesan, dried oregano, and garlic powder.
Season both sides of the chicken breast with the sea salt and black pepper.
Dredge the chicken in the egg wash, then press it firmly into the parmesan mixture until evenly coated.
Heat the olive oil in a non-stick skillet over medium heat and sear the chicken for 5-6 minutes per side until golden brown and cooked through.
Remove the chicken from the pan and, in the same skillet, sauté the zucchini for 3-4 minutes until tender and slightly browned.
While the zucchini cooks, warm the marinara sauce in a small saucepan over low heat.
Place the warm marinara on a plate, top with the crispy chicken, and serve the zucchini alongside.