Caramelized Onion Dip - Sprinkles & Sea Salt

Ingredients

• 2 tbsp unsalted butter
• 4 small yellow onions, sliced thin
• 1/4 tsp salt
• 2 tbsp brown sugar
• 1 tbsp dry sherry (optional)
• 1 tbsp balsamic vinegar
• 1/4 cup sour cream
• 1/4 cup mayonnaise
• 1 tsp dijon mustard
• 1/4 tsp garlic powder
• 1/2 cup gruyere
• 1/4 cup grated parmesan cheese
• 2 tbsp bread crumbs