Meatballs

I need a meatball recipe. When I try to make them without a recipe (just adding some spices, some bread crumbs or oatmeal, an egg, maybe some onion...) they always end up tasting great...but they often break apart in the pan. Here's a basic one. Dress it up with various spices, sauces, etc.

Easy Potluck Meatballs
1 lb ground beef
1 egg
2/3 C bread crumbs
1/2 C grated onion
1 tsp salt
1/2 tsp ground allspice
1/4 tsp pepper

Combine everything in a bowl and mix well. Shape into balls. Brown meatballs in a skillet over medium heat. Transfer to a 1 1/2 quart baking dish. Bake, uncovered, at 350° until no longer pink in center; baking time will vary with the size of your meatballs. If you make little bite-sized meatballs, they may cook right through just from browning in the skillet; you could serve directly from there.

Variations:
1. Use ground turkey.
2. Use seasoned bread crumbs.
3. Add 1/2 tsp spice-of-your-choice instead of allspice. (Thyme is delicious. Like things hot? Add chili powder. Serving the meatballs with spaghetti & sauce? Use oregano; or, for a sweeter blend, try cinnamon. - A little cinnamon in marinara sauce is nice.)
4. After browning the meatballs, make a simple gravy (see below) in the skillet -- to incorporate all the browned bits of meat left in the pan; dump it over the meatballs before baking.
5. Sweet and sour meatballs...try this recipe.

Meatballs in Gravy
Make meatballs according to recipe above.
Combine 1 Tbsp cornstarch with 1 10 oz can of beef consummé (undiluted) in the skillet. Heat to boiling stirring and gently scraping up the browned bits of meat in the skillet. Boil until consummé thickens. Pour over meatballs; bake as directed above. I added some extra, finely-diced onion to the gravy.