Scoop about 3/4 cup worth of the chicken and bean mixture onto the center of each tortilla. Sprinkle with 1/4 cup of cheese each. Brush the outside of the tortilla with butter and fold the tortilla. To fold, bring in both sides, then bring the bottom upward, and then turn the whole chimichanga over, longways, to fold over the remaining top side. Move to a prepared baking sheet. Brush each chimichanga with the melted butter.