Savory French Onion Meatballs with Gruyère - chefmelt

Ingredients

• 1 large egg
• 450 g minced beef
• 1 teaspoon onion powder
• 1/2 cup Parmesan cheese, grated
• 2 garlic cloves, finely chopped
• 1 cup of breadcrumbs
• 1/4 cup fresh parsley, chopped up
• Season with salt and pepper as needed
• 1 teaspoon fresh thyme (or use 1/2 teaspoon dried)
• 2 large onions, sliced thin
• 1 cup Gruyère cheese, shredded
• 1 cup beef stock
• 2 tablespoons unsalted butter
• 2 tablespoons olive oil
• 1 tablespoon balsamic vinegar
• Fresh parsley leaves for a touch of color