Cook your lasagna noodles according to the package instructions. Make sure to cook the noodles al dente.
While your pasta is cooking, brown the ground beef in a pan over medium heat. Once you no longer see any red, pour the meat into a strainer to drain the fat. Return beef to the pan.
In the pan with the meat, pour in the tomato sauce, garlic powder, salt, and pepper. Stir until combined. Remove from heat and let sit in the pan.
Grease a 9x13 casserole dish. To assemble, start with three lasagna noodles on the bottom of the dish. Then, add 1/3 of the meat mixture. On top of the meat, add 1/3 of the shredded mozzarella cheese. Repeat 3 times for a total of 9 layers (3 layers of each ingredient).
Cook at 400 degrees for about 20-25 minutes, or until the cheese begins to brown.
Serve immediately or store for a later meal. To refrigerate or freeze, cut into individual portions and wrap each in tin foil or freezer paper. Leftovers will last 2-4 days in the fridge or a couple months in the freezer. Reheat in the microwave or oven.