Heat the oil in a skillet and brown the sausage over medium heat.
Add about 2 tablespoons of water to the skillet, cover with a lid, and cook for about 20 minutes, turning once during the process.
Roughly chop the sausage links.
Preheat a large skillet or flat grill over medium-high heat and melt margarine.
Add the cooked potatoes and saute until golden brown.
Add onions, green peppers, tomatoes, browned sausage, and jalapeno peppers.
Saute together for 5 minutes.
Mix in beaten eggs until the eggs are cooked.
Divide jumbot in half in the skillet or grill, and add 8 ounces of the cheddar cheese to 1 half of jumbot.
Take the other half of jumbot and lay it on top of cheese.
Sprinkle remaining cheese on top.
