Baked Onion Dip in a Bread Bowl

Preheat oven to 350°. In a large skillet over medium heat, heat oil. Add onions and cook, stirring occasionally, until golden and caramelized, 20 minutes. Add garlic and cook 2 minutes more. Scrape onions and garlic into a large bowl and add cheese, cream cheese, and mayo. Season with salt and pepper. Transfer dip to bread bowl and place on a baking sheet. Bake until warmed and bubbly, 15 minutes. Serve warm with bread.