Heat a heavy skillet on medium high heat, add oil when hot.

Add diced peppers and onion to a pan and cook on medium high until browned.

When vegetables are browned, remove from pan and add to a bowl on the side OR cook eggs with the veg in the pan (depending on your preference)

Add eggs to pan and stir often to prevent sticking or burning.

Add in cheese and keep stirring until eggs are fluffy and slightly firm.

Add eggs and pepper/onion mix into tacos and top with cheese.

Garnish with fresh diced green onions if desired.