Saute onions and peppers till onions start to wilt.
Add beans, let cook for 3 minutes.
Mix in Frontera sauce. Cook for about 7 minutes or until peppers start to soften.
Place tortillas in the oven directly on shelf. Bake about 5 minutes, you want it to just start getting hard, but still pliable.
Take tortillas out of oven and immediately shape into taco shell shape. May want to use a paper towel, tortillas are hot to handle. You could always drape them over 2 grates and let the oven do the shaping, but I found them to be to wide for me.
Assemble tacos with all the fixins, sour cream, and hot sauce.