Heat olive oil in a nonstick skillet over medium heat. Add onion and bell pepper, sauté until softened, about 4-5 minutes.
Add spinach, cook until wilted.
In a bowl, whisk eggs with cumin
Pour eggs into skillet with veggies. Cook gently, stirring occasionally, until eggs are scrambled and just set. Remove from heat and let cool
Cook black beans in skillet. Remove form heat and let cool
Divide the egg and bean mixture evenly among the tortillas, then roll up burrito style.
Optional, pan fry burritos once filled.
If freezing, let burrito cool completely, then wrap each burrito tightly in foil or parchment paper.
Store in fridge for up to 4 days or freezer safe bag for up to 2 month
To reheat from frozen, discard the foil and place on microwave safe plate. Cover the burrito with a damp paper towel and cook in the microwave for 1-3 minutes. Cut in half to see if the burrito is heated through. If not, cover again with a damp paper towel then heat for an additional 1-2 minutes.