Tuna Noodle Casserole from Scratch

INGREDIENTS

• 1/2 cup butter, divided
• 1 (8 ounce) package uncooked medium egg noodles
• 1/2 medium onion, finely chopped
• 1 stalk celery, finely chopped
• 1 clove garlic, minced
• 8 ounces button mushrooms, sliced
• 1/4 cup all-purpose flour
• 2 cups milk
• salt and pepper to taste
• 2 (6 ounce) cans tuna, drained and flaked
• 1 cup frozen peas, thawed
• 3 tablespoons bread crumbs
• 2 tablespoons butter, melted
• 1 cup shredded Cheddar cheese