The Best Grilled Cheese Sandwich

Ingredients:

• 8 slices of high-quality sourdough bread
• 4 tablespoons unsalted butter, softened
• 2 cups sharp cheddar cheese, shredded
• 1 cup Gruyère cheese, shredded
• 1/2 cup Parmesan cheese, grated
• 1 teaspoon Dijon mustard
• 1/2 teaspoon garlic powder
• Salt and pepper to taste

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