Cook rice with water, olive oil and salt in a rice cooker or pot on the stove until liquid is absorbed.
Meanwhile, make guacamole by mashing avocados and mixing in lime juice, red onion, cilantro and salt & pepper to taste.
Heat olive oil in a large skillet over medium-high heat. Add black beans, corn, chipotles, garlic, and taco seasoning, sauteeing for 2-3 minutes and seasoning with salt & pepper to taste.
Remove black beans from heat and set aside, then add more olive oil and saute bell pepper and onions in the same skillet for 5 minutes until softened, seasoning with salt & pepper to taste.
Now you're ready to assemble your burritos. Divide cooked rice, black beans, veggies, salsa, cheese and guacamole among 4 flour tortillas, fold sides in then roll away from you.
Toast burritos for 2 minutes in a skillet over medium heat if desired, or serve right away and enjoy!