Preheat oven to 375 degrees Fahrenheit.

To save prep time, make the penne pasta according to the package directions until the noodles are al dente. That means that the pasta will be tender but have a little resistance in the middle when you bite into a noodle. Drain and set aside.

While the noodles are cooking, start the beef mixture. In a large skillet on medium-high heat, brown the beef and add the diced onion cooking until they are translucent. If you are able to, use a ground chuck. Using a lean beef will reduce the fat. Drain fat off the meat before continuing with the rest of the recipe.

Next add the tomato sauce, salt, and pepper to the meat mixture. Simmer while working on the pasta mixture.

In a separate medium bowl, add the cooked pasta, sour cream, and cottage cheese. Stir to combine.

Assemble in a prepared 9 X 13 baking pan or casserole dish.

To assemble, layer half the sour cream mixture, next spoon half the meat sauce on the pasta layer. Sprinkle half the shredded cheese over the top. Repeat with the remaining noodles, meat, and final layer of cheese.

Bake uncovered in a 375 degree oven for 30 minutes or until the casserole is hot and bubble and the cheese is melted.

Serve this easy weeknight meal with crusty bread, a side salad, or a simple vegetable side dish.