Preheat oven to 400°. In a skillet, cook sausage over medium heat 4-5 minutes or until no longer pink, breaking into crumbles. Remove to paper towels to drain. In a small bowl, whisk eggs, seasoned salt and pepper. Pour into same pan; cook and stir over medium heat until eggs are thickened and no liquid egg remains. Remove from heat. In a large bowl, prepare muffin mix according to package directions. Fold in sausage, scrambled eggs and 1/2 cup cheese. Fill paper-lined muffin cups two-thirds full. Bake 10 minutes. Sprinkle with remaining cheese; bake 5 minutes longer or until a toothpick inserted in center comes out clean. Cool 5 minutes before removing from pan. Serve warm.