Before anything goes into the crockpot, I drain and rinse my canned beans and corn so I'm not adding excess sodium or liquid. I also give my chipotle peppers a rough chop so their smoky flavor spreads evenly. This small step only takes a few minutes but makes a big difference in the final taste.
I add the beans, corn, diced tomatoes, vegetable broth, chopped chipotle peppers, salsa, brown rice, taco seasoning, and cumin straight into the slow cooker. I give it all one good stir so the seasoning doesn't clump in one spot. This is the only "cooking" step I actually have to do myself.
I cover the crockpot and set it to low for 6 to 8 hours, or high for 3 to 4 hours if I'm short on time. The rice slowly turns tender while it soaks up all that smoky, seasoned broth. By the end, most of the liquid should be fully absorbed into the filling.
Around the halfway mark, I like to lift the lid and give everything a quick stir. This helps the rice cook evenly and keeps anything from sticking to the bottom. If the mixture looks too dry, I add warm broth or water in small splashes to loosen it up.
Once the filling is tender and thick, I lay out my tortillas and spoon about 1/3 to 1/2 cup of the bean and rice mixture onto each one. I fold in the sides first, then roll it up tightly so nothing spills out when I take a bite.
I like serving these burritos right away while they're warm and the filling is still soft. If I'm meal-prepping, I let the filling cool slightly before storing it separately from the tortillas so they don't turn soggy.