Throw all the ingredients in a InstaPot.
Pour water over all the ingredients
Mash all the ingredients together using a large potato masher.
Pressure cook 25 minutes.
The goal is a saucy consistency that ladles easily over the spaghetti.
Boil spaghetti until it's soft.
Follow the directions on the spaghetti package and add 3 to 5 minutes.
Drain spaghetti into a colander and then transfer back to the pot. After you make sure that your pasta pot is off the heat, pour one large spoonful of the chili into the pasta pot and mix. (This step prevents the pasta from sticking together.)
Use tongs to serve spaghetti on large plates.
Ladle a large amount of chili on top of each plate of spaghetti.
Optional: Place chopped raw onions and/or kidney beans on top of the chili.
Use your hands to smother everything with a mountain of grated cheddar cheese. You should only see the bare edge of the chili and spaghetti.