1. In a small skillet, cook onion in butter over medium heat until tender. Add sugar; cook 10-15 minutes longer or until golden brown. Add garlic; cook for 1 minute. Cool slightly.
2. In a small bowl, combine the biscuit mix, milk and egg. Fold in 1/2 cup cheese, seasoning blend and onion mixture. Transfer to an 8-in.-square baking dish coated with cooking spray. Sprinkle with remaining cheese.
3. Bake at 400° for 18-22 minutes or until a toothpick inserted near the center comes out clean. Cut into squares; serve warm.