1. In a large mixing bowl, combine the sliced flank steak with olive oil, ground cumin, smoked paprika, salt, and pepper. Let it marinate for at least 15 minutes to enhance the flavors.
2. Heat a large skillet over medium-high heat. Once hot, add the marinated steak slices and cook for about 3-4 minutes on each side, until they are nicely browned and cooked to your liking.
3. Remove the steak from the skillet and let it rest while you prepare the rest of the bowl.
4. In the same skillet, add the red bell pepper slices and sauté until they are tender-crisp, about 4-5 minutes.
5. To assemble the bowls, start by placing a scoop of cooked brown rice at the bottom of each bowl. Top with sliced steak, sautéed bell peppers, black beans, and avocado slices.
6. Sprinkle with chopped cilantro and serve with lime wedges on the side for a zesty finish.

Each step is a nod to the meals my family and I would prepare together, bustling around the kitchen, guided by the aromas and excitement of the flavors coming together.