Place the bacon in a cold cast-iron skillet and turn the heat to medium, cooking until the strips are golden and crispy.
Remove the bacon to a paper towel-lined plate, leaving about a teaspoon of rendered fat in the pan or adding the ghee if more fat is needed.
Add the diced red bell pepper to the skillet and sauté for 3 to 4 minutes until slightly softened and fragrant.
Stir in the black beans and baby spinach, cooking just until the spinach is wilted and the beans are heated through.
In a medium bowl, whisk together the whole eggs, liquid egg whites, sea salt, and black pepper until well combined.
Lower the heat to medium-low and pour the egg mixture into the skillet, gently folding the ingredients together.
Continue to cook, stirring occasionally with a spatula, until the eggs are just set but still moist.
Crumble the reserved crispy bacon over the top and serve immediately.