Preheat a skillet on medium with a splash of olive oil.I use a cast iron skillet and don't need a lot of oil. Particularly because sweet potatoes don't absorb as much oil as other types of potatoes do. If you're using another type of skillet, you might need more oil. I like to start with a very thin layer, just enough to cover the skillet, and then add more as needed while cooking.
Meanwhile, dice the sweet potato and bell pepper.I cut the sweet potatoes into 6 slices, like a pizza. This is how I end up with triangles. But you can chop them however you like.
Add sweet potato and bell pepper to skillet. Stir to coat with oil. Cook covered for about 15-20 minutes, or until tender and lightly browned. Making sure to stir frequently.If it browns too quickly, add more oil and lower the temperature. If it doesn't brown quickly enough, increase the heat.
Once cooked, add salt, pepper, cumin, and coriander to taste.
Top with freshly sliced avocados and serve immediately.