Pound chicken breasts to about 1/2-inch thickness.
4 boneless
Season both sides of chicken with seasoned salt, black pepper, garlic powder, and cayenne; dredge lightly in flour and shake off any excess.
Seasoned salt to taste, Cracked Black Pepper to taste, 1/2 teaspoon garlic powder, 1/4 teaspoon cayenne, 1/4 cup all-purpose flour
Heat oil in a skillet over medium-high heat. Place chicken in the pan, reduce heat to medium, and cook until the chicken browned and cooked through, about 5 minutes per side; remove chicken from the skillet to a plate.
2 tablespoons olive oil
Cook capers and mushrooms in reserved oil, about 30 seconds.
2 tablespoons capers, 1/4 cup mushrooms
Pour chicken broth into skillet. Scrape any browned bits from the bottom of the pan. Cook until reduced by half, about 2 minutes.
1/2 cup chicken broth
Stir lemon juice, water, and butter into the mixture; cook and stir continuously to form a thick sauce, about 2 minutes. Reduce heat to low.
1/4 cup lemon juice, 1/4 cup water, 3 tablespoons butter
Return chicken breasts to the pan cook until heated through, 1 to 2 minutes. Serve with sauce spooned over the top and sprinkle green onions on top.
2 tablespoons chopped fresh green onions