Finely dice the red bell pepper and yellow onion into uniform pieces.
In a small mixing bowl, whisk together the large eggs, liquid egg whites, sea salt, black pepper, and garlic powder until the mixture is smooth and aerated.
Heat the avocado oil in a medium non-stick skillet over medium-high heat.
Add the diced peppers and onions to the skillet and sauté for 3-4 minutes until the vegetables are tender and the onions are translucent.
Reduce the heat to medium and pour the egg mixture into the skillet with the vegetables.
Using a silicone spatula, gently push the eggs from the edges toward the center, cooking until they are set but still moist and fluffy.
Warm the whole grain tortilla in a separate dry pan for 20 seconds per side until soft and pliable.
Lay the tortilla flat and layer the scrambled eggs, black beans, and shredded sharp cheddar cheese in the center.
Fold the left and right sides of the tortilla inward, then roll from the bottom up to seal the burrito tightly.
Place the assembled burrito back in the hot skillet for 60 seconds per side to melt the cheese and create a golden, toasted exterior.