Inside-Out Ravioli's

I'm not sure where this recipe came from, my mom often made it when I was growing up.  Most everyone loves this, except Andrew.  At least he doesn't love it unless I considerably reduce the amount of spinach from the recipe.  I also usually use ground pork instead of ground beef, and I don't know that I even ever used the bread crumbs. 
2 lb ground beef
1/2 chopped onion
1 clove garlic, minced
1 10 oz. pkg.  frozen chopped spinach
1 bottle spaghetti sauce
1  7oz. pkg shell or elbow macaroni
4 oz. sharp shredded cheese
1/2 cup soft bread crumbs
2 well beaten eggs
1/4 c salad oil
salt and pepper to taste

Brown first 3 ingredients in large skillet and add spaghetti sauce.  Cook spinach using package directions.  Drain.  Combine spinach with macaroni and remaining ingredients and spread in 9x13 pan.  Top with meat sauce. Bake at 350 for 30 minutes.