Cheesy Mustard Baked Chicken

Ingredients (12)

• 3 boneless
• 3 tablespoons butter
• Kosher salt and freshly ground black pepper
• 2 heaping tablespoons shallots
• 1 garlic clove
• 1 tablespoon all-purpose flour
• 3/4 cup whole milk
• 1 tablespoon whole grain mustard
• 1 cup extra sharp white cheddar cheese
• 1/2 cup Parmesan cheese
• 1/3 cup panko bread crumbs
• Italian flat leaf parsley