Combine garlic powder, onion powder, poultry seasoning, and lemon pepper. Sprinkle spice mix on both sides of chicken breasts, then coat each side with Parmesan cheese and flour.
Heat a heavy skillet over medium-high heat. When hot, add olive oil and swirl to coat the pan. Brown chicken breasts on both sides, turning only once. It should not be cooked through and through. Remove to a plate and keep warm.
Add white wine to deglaze the pan, scraping up any browned bits. Cook for 1 minute, then add chicken broth. Bring to a simmer and return chicken breasts to the pan. Simmer until liquid is reduced by half, then add green onions and capers. Cook an additional 2 minutes. Serve chicken breasts with pan gravy.