Place the chicken breast between two sheets of parchment paper and pound with a meat mallet until it is an even 1/2-inch thickness.
In a shallow bowl, whisk the egg until smooth.
In a second shallow bowl, combine the almond flour, sea salt, black pepper, and garlic powder.
Dip the chicken breast into the whisked egg, allowing any excess to drip off, then dredge it through the almond flour mixture until fully coated.
Heat the avocado oil in a non-stick skillet over medium heat.
Place the chicken in the skillet and cook for 4-5 minutes per side until the crust is golden brown and the chicken is cooked through.
In a small bowl, whisk the olive oil with a squeeze of lemon juice, then toss with the arugula.
Serve the crispy schnitzel immediately with the arugula salad and the remaining lemon wedge on the side.