Warm tortillas (cold tortillas are more likely to tear): Wrap the tortillas in damp paper towels and microwave for 20-30 seconds or until warm or toss each tortilla in a hot skillet for about 15 seconds each. Keep the tortillas warm before layering.
For 10-inch tortillas: Layer each tortilla with: 1/4 cup rice, 1/4 cup black beans, 1 1/2 tablespoons chipotle sauce or sour cream, 1 1/2 tablespoons guacamole, 1/3 cup ground beef, and 2 tablespoons cheese down the center of the tortilla (feel free to increase sauce, guac and cheese). (You do NOT need to cook uncooked tortillas first if using.) For 12-inch tortillas: Layer each tortilla with: 1/3 cup rice, 1/3 cup black beans, 2 tablespoons chipotle sauce or sour cream, 2 tablespoons guacamole, 1/2 cup ground beef, and 3 tablespoons cheese down the center of the tortilla (feel free to increase sauce, guac and cheese). (You do NOT need to cook uncooked tortillas first if using.) Roll up tortillas burrito style by folding in the edges next to the filling, folding up the bottom over the filling, then tightly rolling from the bottom, squeezing in any escaping filling as you roll. Place seam side down.
If meal prepping, tightly wrap burritos in foil at this time before toasting and either refrigerate or freeze (see Notes).