Prep fast. Dice sweet potatoes small so they cook quickly. Chop onion and pepper. Rinse black beans.
Start the skillet. Heat olive oil in a large nonstick or cast-iron skillet over medium heat until shimmering.
Cook the sweet potatoes. Add diced sweet potatoes in an even layer.
Season with salt and pepper. Cook 6–8 minutes, stirring every 2 minutes, until edges start to brown.
Add aromatics. Stir in onion and bell pepper. Cook 4–5 minutes, until onions are soft and sweet potatoes are tender.
Spice it up. Add garlic, smoked paprika, cumin, and chili flakes.
Cook 30–60 seconds until fragrant.
Stir in beans and greens. Add black beans and a handful of spinach or kale. Cook 1–2 minutes, just to warm beans and wilt greens. Taste and adjust salt and pepper.
Optional eggs. For a hearty finish, either fry eggs in a separate pan or make small wells in the hash, crack eggs in, cover, and cook on low 3–5 minutes until set to your liking.
Finish and serve. Top with chopped cilantro or green onions.
Add hot sauce or salsa. Serve right from the skillet.