We have a recipe we use in my family that I just throw together:
1 lb of meat
1 tsp of salt
1 egg beaten
1 garlic clove
About 1/4 cup of finely chopped parsley
1/4 cup fresh grated Parmesan
First: take a piece of sandwich bread and soak it in some milk. Add the rest of the ingredients, mix together and then fry in a little olive oil on the stove until browned and cooked through.
I also find this recipe quite good:
https://www.onceuponachef.com/recipes/spaghetti-and-meatballs.html