Preheat oven to 375 degrees.
Spray 9x13 baking dish with cooking spray and set aside.
Cook egg noodles according to directions and set aside.
6 ounces package egg noodles
Cook the ground beef and onion over medium heat until meat is brown. Drain grease from pan.
1 pound lean ground beef, 1 small onion
Add garlic and Italian seasoning, and salt and pepper and stir to combine.
1 teaspoon garlic, 1 teaspoon Italian Seasoning, salt and pepper
Add tomato sauce and diced tomatoes and frozen vegetables into the skillet, mix to combine.
8 ounces can tomato sauce, 14 ounces diced tomatoes, 1 cup frozen vegetables
Simmer meat mixture for 3 minutes, continuing to stir
Combine meat mixture, noodles, and 1 cup of the shredded cheese and mix to combine. Pour mixture into prepared baking dish.
2 cups shredded cheddar cheese
Top with remaining cheese or breadcrumbs mixed with melted butter and bake for 23-25 minutes in the oven, until the casserole is heated through.