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Ingredients
- 1 bag (22 ounces) frozen meatballs, prepared according to package instructions
- 2 tablespoons unsalted butter
- 2 large yellow onions, thinly sliced into half-moon shapes
- 1 tablespoon all-purpose flour
- 1 ½ cups (12 ounces / 360 g) beef broth
- ¼ teaspoon kosher salt
- ¼ teaspoon black pepper
- 1 cup (113 g) mozzarella cheese, shredded
- 1 cup (113 g) Gruyere cheese, shredded
- Parsley, chopped for garnish
Instructions
- In a large oven-safe, non-stick skillet over medium-high heat, melt the butter.
- Add the onions and sauté for 25-30 minutes, stirring occasionally, until tender and caramelized.
- Sprinkle flour over the onions and stir to combine.
- Add beef broth, salt, and pepper. Cook for 7 minutes or until the sauce thickens.
- Nestle the cooked meatballs into the sauce.
- Sprinkle with mozzarella and Gruyere cheese.
- Preheat the oven broiler and broil for 2-3 minutes, until the cheese is bubbly.
- Garnish with parsley and serve warm.
- Prep Time: 10 minutes
- Cook Time: 40 minutes
Nutrition
- Serving Size: 4 servings
- Calories: 600 kcal per serving
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