You're a key ingredient in the fight against AIDS. But don't take it from us—take it from chef Emeril Lagasse, whose timeless mustard chicken recipe was. Ingredients. 1/2 cup all-purpose flour. 1 tablespoon Essence, recipe follows. 2 (6 to 8-ounce) boneless, skinless chicken breasts, cut in halves and pounded thin. 1 tablespoon olive oil. 4 tablespoons butter. 3 cups sliced mushrooms (cremini, oyster, shiitake) 3/4 cup Marsala. 1 cup chicken stock.