Make the dressing: combine avocado oil, rice vinegar (or lemon juice), maple syrup (or honey), minced shallot, Dijon or whole grain mustard, poppy seeds, and 1/2 tsp sea salt in a blender and blend until smooth; refrigerate until ready to use.
Preheat oven to 400°F (200°C) and lightly spray or oil a large shallow baking dish.
Prepare the chicken: slice each chicken breast in half horizontally to make four thinner cutlets.
Set up dredging station: whisk the egg in a shallow bowl. On a large plate mix the gluten-free flour, breadcrumbs, 1/2 tsp sea salt, and 1/4 tsp black pepper.
Coat the chicken: dip each cutlet into the beaten egg, then press both sides into the breadcrumb mixture until evenly coated.
Arrange the breaded cutlets in a single layer in the prepared baking dish and bake 12–15 minutes, until the chicken reaches 165°F (74°C) and is crispy outside.
Let the chicken rest for at least 10 minutes, then slice into strips or bite-sized pieces.
Assemble the salad: in a large bowl combine the greens, thinly sliced red cabbage, chopped strawberries, diced avocado, chopped green onion, edamame (if using), sliced almonds, pumpkin seeds, and crumbled feta.
Toss the salad with desired amount of poppy seed dressing, then divide into four large bowls and top each with sliced crispy chicken.