Warm the tortillas in a skillet over medium heat for about 30 seconds on each side.
In a large bowl, mix the cooked rice, black beans, and grilled protein.
Lay a tortilla flat on a clean surface.
Spoon 1/4 of the rice and bean mixture onto the center of the tortilla.
Add a handful of shredded cheese on top.
Layer diced tomatoes and shredded lettuce over the cheese.
Place a few slices of avocado on top.
Add a spoonful of sour cream and a drizzle of salsa.
Fold the sides of the tortilla over the filling, then roll it from the bottom up to enclose the filling.
Repeat the process for the remaining tortillas and fillings.