Prepare the Ingredients: Dice the red onion and green bell pepper. Drain and rinse the black beans. Prepare the fresh fruit as needed.
Cook the Veggies: Heat butter in a medium nonstick skillet over medium heat. Add diced red onion and bell pepper, sautéing until softened, about 2 minutes.
Scramble the Eggs: Add the beaten eggs to the skillet with the veggies. Cook, stirring gently, until just set, about 2–3 minutes. Season with salt and black pepper, then remove from heat.
Warm the Tortillas: Heat the whole wheat tortillas in a skillet over medium heat for 15–20 seconds per side, or microwave them wrapped in a damp paper towel for 20 seconds, until pliable.
Assemble the Burritos: Lay each tortilla flat. Portion the scrambled eggs and black beans down the center. If desired, sprinkle with cheese. Fold in the sides and roll up into a burrito. Cut in half.
Serve: Plate the burritos with fresh fruit on the side and orange juice.