01 - In a small bowl, combine diced tomatoes, finely chopped red onion, minced jalapeño, chopped cilantro, lime juice, and a pinch of salt. Stir thoroughly and set aside to allow the flavors to meld.
02 - In a medium bowl, whisk together the large eggs with milk, a pinch of salt, and black pepper.
03 - Heat a nonstick skillet over medium heat. Add a small amount of cooking oil. Sauté the diced red bell pepper and diced red onion until they are tender, approximately 3-4 minutes. Incorporate the baby spinach and cook until it wilts, about 1 minute. Remove the sautéed vegetables from the skillet and set aside.
04 - In the same skillet, pour the whisked egg mixture. Cook gently, stirring frequently, until the eggs are just set. If using, stir in the shredded cheddar cheese.
05 - Heat the cooked brown rice (or quinoa) and the rinsed and drained black beans until they are thoroughly warm. This can be done in a microwave or on the stovetop.
06 - Divide the warmed brown rice (or quinoa) evenly among four individual bowls. Top each portion with the sautéed vegetables, scrambled eggs, black beans, halved cherry tomatoes, and sliced avocado.
07 - Spoon a generous portion of the prepared salsa over each assembled bowl. Add any desired optional toppings such as sour cream, Greek yogurt, fresh cilantro, or hot sauce.