Not Your Auntie's Tuna Bake | Cooking Professionally

Ingredients

• 14 ounces penne pasta
• 4 tablespoons butter
• 4 tablespoons flour
• 2 cups milk, at room temperature
• 1 cup vegetable stock
• 1 teaspoon Dijon mustard
• salt, to taste
• white pepper, to taste
• 1/4 teaspoon onion powder, optional
• 1/4 teaspoon garlic powder, optional
• 2 cups sharp mature cheddar, grated
• 2 (5-ounce) cans tuna chunks, drained
• 1 (7-ounce) can sweet corn, drained
• 1 slice bread, pulsed into crumbs
• black pepper, to taste
• cooking spray
• fresh chives, finely diced, for serving