Cooking Know-How
Don't worry if the sandwich is stuffed high with filling ingredients - it will reduce when baked.
How to Make Caramelized Onions
Peel 2 medium onions, then cut into 1/4-inch-thick slices. (You should have about 2 cups onion slices.) Heat 1 Tbsp. oil in large skillet on medium heat. Add onions; cook 20 to 25 min. or until lightly browned, stirring occasionally. Stir in 1-1/2 tsp. sugar; cook 5 min. or until golden brown, stirring occasionally.