Cheeseburger Casserole

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1. 1
   Preheat the oven to 350 degrees. Spray a 9 x 13 inch baking dish with cooking spray.
2. 2
   In a large pot of boiling salted water, cook the pasta according to the package directions for al dente and drain well.
3. 3
   Meanwhile, in a large skillet, heat the oil over medium-low heat. Add the onions and cook until soft, about 5 minutes. Stir in the garlic and cook for 30 seconds.
4. 4
   Stir in the beef and cook until browned; season with salt and pepper.
5. 5
   Stir in the tomato paste, then add the tomatoes and mustard. Let the mixture bubble gently until it is slightly thickened, about 2 minutes.
6. 6
   Toss the meat mixture with the pasta and spread it into the prepared dish.
7. 7
   Top with the cheddar and bake until the cheese is melted, about 15 minutes. Sprinkle the chopped pickles over the top and serve.