Put bean flour and water in a medium-sized saucepan and cook over medium heat. Stir constantly while the beans start to thicken {1-3 minutes}. After they’ve started thickening, add spices, turn the heat down to low and simmer for 5 minutes.
Viola!! Homemade Refried Beans in under 10 minutes.
Notes
If you want to grind your own bean flour, 1/2 cup dried beans yields about 3/4 cup bean flour. Grind more if you want to have bean flour on hand to make lunchtime even quicker next time!