Chicken Schnitzel

Name: Chicken Schnitzel
Ingredients: 1 small shallot, cut into rings; 3 tbsp. red wine vinegar; 1 1/4 tsp. kosher salt, plus more to taste; 3 large skinless, boneless chicken breasts (about 12 ounces each); 1/2 tsp. black pepper; 1/4 tsp. garlic powder; 1 c. all-purpose flour; 2 large eggs, lightly beaten; 1 1/2 c. seasoned breadcrumbs; Vegetable oil, for frying; 1 tbsp. whole grain mustard; 3 tbsp. olive oil; 1 5-ounce container mixed baby greens; 4 radishes, thinly sliced; Lemon wedges, for serving