Spread bread slices with mustard. Layer Wisconsin Gouda, ham, onion, spinach and Wisconsin Dill Havarti between bread. Heat nonstick skillet over medium-high heat. Brush top and bottom of sandwich lightly with Butter; place sandwich in skillet and cook about 3 minutes per side until bread crisps slightly and Cheese begins to melt.

*Note: For caramelized onions, cut a small onion in half and slice thinly. Melt 1/2 teaspoon Butter in a skillet. Add onion slices, a pinch each of salt and sugar; cook and stir over medium-high heat about 5 minutes or until the onion begins to brown. Add 1 tablespoon water and continue cooking on medium-low heat 10 to 15 minutes or until the onion is a deep golden brown.

©Jones Dairy Farm and Wisconsin Milk Marketing Board