This decadent smoked Gouda and caramelized onion dip combines rich, creamy cheeses with sweet, deeply caramelized onions for a flavorful appetizer perfect for parties or cozy nights in. Slow-cooked onions are folded into a mix of Gouda, cream cheese, sour cream, and mayonnaise, then baked until bubbly and golden, creating a luscious dip that pairs beautifully with crackers, bread, or vegetables.