Preheat oven to 400 degrees. Heat olive oil in saute pan and saute chopped onions until translucent. Set aside.
Season the steak in a bowl with the Adobo and cracked pepper. In same pan, add a tbsp of olive oil and add the sirloin beef strips. Cooks steak strips until nicely browned and cooked through, about 10-15 min.
While steak is cooking, cut the tops off the green peppers and scoop out all the inside seeds and ribbing.
A few minutes before steak is done, add the cooked onions back into pan and stir. Add the habanero peppers and cover until steak is done.
Grease a baking sheet and stuff the peppers with equal amounts of steak and onions. Mix both cheddar and mozzarella cheese and add equal amounts of cheese to each of the stuffed peppers.
Place stuffed peppers on pan and bake for 15-20 minutes in preheated oven until cheese melts and peppers have crisped edges and are a little soft. Carefully remove from oven and enjoy.