Skillet French Onion Angus Meatball Bake Recipe

Ingredients

• 1 pkg. (26 oz.)
• 2 tablespoons unsalted butter
• 2 tablespoons olive oil
• 4 cups (¼-inch-thick) sliced onions (about 2 large)
• 3 cloves garlic minced
• 1 tablespoon all-purpose flour
• 2 cups beef broth
• 2 teaspoons chopped fresh thyme
• ¼ teaspoon salt
• ¼ teaspoon ground black pepper
• 1 cup shredded Gruyère cheese