Pulled Pork Mac and Cheese

Ingredients

• 2 cups cooked shredded pork
• 3/4 cup barbecue sauce
• 1 pound uncooked elbow macaroni
• 1/4 cup butter
• 1/4 cup chopped onion
• 1/4 cup all-purpose flour
• 2 cups whole milk
• 1-1/4 teaspoons salt
• 1/2 teaspoon pepper
• 1/4 teaspoon garlic powder
• 1-1/2 cups shredded mild cheddar cheese
• 1 cup shredded sharp cheddar cheese, divided