Slow Cooker French Onion Meatloaf with Melted Cheese - Faxo

Ingredients

• 3 or 4 large sweet onions, sliced
• 1 T. olive oil
• 1 t. sea salt
• 1/2 to 1 t. freshly ground black pepper
• 1 t. sugar
• 4 T. salted butter, cubed
• 1 lb. ground beef
• 1 c. Italian herb bread crumbs
• 1 c. milk
• 1 egg
• 1 oz. package French onion soup mix
• 1/2 c. cooking sherry
• 1/2 t. Worcestershire sauce
• 4 oz. Swiss, Gruyère or Provolone cheese
• fresh thyme sprigs, for garnish