Preheat oven to 375°F (190°C).
Place sweet potatoes on a baking sheet and bake for approximately 20 - 30 minutes, until fork tender.
While sweet potatoes are baking, warm olive oil in a small pan. Add black beans, peppers, onion, chili powder, cumin, garlic and sea salt. Stir well to combine.
Add ½ cup of water, cover and simmer for 15 minutes over medium-low heat.
While beans are simmering, in a small bowl use a fork to mash avocado with lime juice. Set aside.
Slice tomatoes. Set Aside.
When sweet potatoes are ready, remove from oven. Slice each most of the way through. Divide sweet potatoes between serving plates.
Top with warm bean mixture, fresh spinach, tomato slices and mashed avocado. Enjoy!