
Slice the chicken breasts horizontally, butterflying them open. If the pieces are still bigger than 1/4-inch thickness, pound them with a meat mallet.
Preheat oven to 425°F.
Pat the asparagus dry and spread them on a rimmed baking sheet. Drizzle with olive oil and sprinkle with salt and pepper. Roast for about 10 minutes.
Season chicken breasts with salt and pepper, and dredge in flour.
Coat a sauté pan with nonstick spray, add oil and heat over medium-high. Sauté chicken for about 3-4 minutes per side until golden and cooked through.
Deglaze the pan with white wine, add garlic, and cook until liquid is nearly evaporated.
Add chicken broth, lemon juice, capers, and butter. Once butter melts, pour sauce over chicken.
Garnish with lemon slices and chopped parsley. Serve with cooked asparagus.