Thanks to all of the wonderful help thus far, I've finally been able to make my Überfood. It's called "Nutraloaf", and is kind of like a meatloaf with a bunch of other stuff in it.
It has no real taste (not a problem) and the texture is a little mushy (I will try baking it longer in the oven), but the idea is I can simply eat this 3 times a day, every day, and not have to worry about making any other food.
However, one problem is that I'm getting a metallic aftertaste. I don't know if it's the ingredients, or the fact that I used a normal oven instead of a convection/steam oven.
This is the recipe I used.
2 oz Ground Beef Brown off in kettle and drain thoroughly 4 oz Canned, Chopped Spinach 4 oz Canned Carrots, Diced 4 oz Vegetarian Beans Open and drain all vegetables well 4 oz Applesauce 1 oz Tomato Paste 1/2 cup Potato Flakes 1 cup Bread Crumbs 2 oz Dry Milk Powder 1 tsp Garlic Powder or Flakes Combine beef and vegetables. Gradually blend in remaining ingredients until well combined. Mixture should be stiff but moist enough to spread. Each loaf should weigh 1 1/2 pounds precooked weight and be scaled to insure proper weight. Place mixture into a loaf pan that has been sprayed with pan release and lined with filter paper. Each loaf should bake at 300 degrees Fahrenheit in convection/steam oven for approximately 40 minutes or until the loaf reaches 155 degrees internal temperature.
It is a subtle aftertaste and it went away after I had a stick of Wrigley's gum. I would prefer to not have to chew Wrigley's after every meal, since I don't really like chewing gum. I'm sure a peppermint or buttermint would also help with the aftertaste, but would prefer to fix my nutraloaf recipe or cooking technique.
So how can I remove this metallic aftertaste? Or, where can I even begin looking for what's causing it?