This is the first meal I learned to make when I was in 2nd grade. It is nostalgic for me and one of my family's favorites. Unfortunately for you, I have never measured any of the ingredients. Just do it "to taste".
2 lbs. ground beef
2 or more 16 oz. cans tomato sauce
diced yellow oniondried bread crumbs or crumbled saltine crackers
Pour about half a can of the tomato sauce and some of all other ingredients onto the ground beef. Mix it all up with your hands (remove your rings or else they will get really gunky). Form the meat mixture into a loaf shape and place in a 13 x 9 x 2 baking pan. Place in preheated 350° oven.
Pour the rest of the tomato sauce into a bowl (a large measuring cup is best because of the pouring spout) and mix in some chili powder and Worcestershire sauce. Put aside.
After the meatloaf has been baking for about 30 minutes, remove from oven and drain excess grease. Then pour the rest of the tomato sauce mixture over the top. Put it back in the oven and bake for another 45 minutes or until done (cut into the middle to be sure the meat is not red or pink).
Slice the meatloaf. Serve the tomato sauce gravy over mashed potatoes and over the meatloaf if desired.