This is my mother's tried and true recipe, even if she doesn't make it anymore! If you are concerned about the fat content, you have several choices. Find one of those loaf pans with vents for the fat to drip through or use lean ground turkey. And need I mention smaller portions...
1 lb. ground beef or turkey
1 1/2 cups bread crumbs
1 diced onion
1 egg
1/4 cup catsup
3 Tbs. mustard
1 Tbs. prepared horseradish
salt and pepper to taste (about 1 tsp. and 1/4 tsp. respectively to start with)
Mix together. (I use my Kitchen Aid mixer here too but you can do it by hand or with a wooden spoon.) Put in a loaf pan. Bake at 350 degrees for 45-60 minutes.