Instant Pot French Onion Soup

Ingredients

• 3 tablespoons butter
• 3 medium Vidalia onions, thinly sliced
• 2 shallots, thinly sliced
• 1 tablespoon brown sugar
• 1 teaspoon salt
• 1/4 cup dry red wine (or beef broth)
• 6 cups low-sodium beef broth
• 2 teaspoons Worcestershire sauce
• 1/2 teaspoon dried thyme
• 2 bay leaves
• 8 slices of baguette, cut into 1-inch slices
• 1 teaspoon Dijon mustard
• 1 1/2 cups shredded Gruyere cheese
• 1/2 cup parmesan cheese
• 1/2 teaspoon black pepper