Step 1

Preheat your oven to 375°F and spray a 2-3 quart casserole dish with nonstick cooking spray.

Step 2

Cook the penne pasta as per directions on the package to 1 minute less than al dente. Drain well and cool under cold running water.

Step 3

Heat olive oil in a large skillet over medium heat and cook the onions until translucent.

Step 4

Add the ground beef to the skillet and cook, breaking it up as you go, until no longer pink.

Step 5

Stir in garlic and cook for an additional minute.

Step 6

Add the tomato sauce, ketchup, brown sugar, ground mustard, chili powder, oregano, paprika, and Worcestershire sauce to the skillet. Season with salt, and pepper, then simmer for 5 minutes. Add the diced bell pepper and mix to combine.

Step 7

Toss the sauce with the cooked pasta and transfer to the prepared casserole dish.

Step 8

Crumble hamburger buns over the top of the casserole, then drizzle with melted butter.

Step 9

Bake covered for 20 minutes. Uncover and bake for an additional 5-10 minutes or until browned and bubbly.

Step 10

Serve and enjoy!