Preheat oven to 425 degrees
Line a baking sheet with aluminum foil, and spread 1 tablespoon olive oil on sheet and on bottoms and sides of peppers. Place peppers, cut sides up, on baking sheet, and set aside
Saute onions and jalapeno peppers in 1 tablespoon olive oil on medium high heat until slightly soft
Add ground beef, cook until brown, and add seasonings
Stir in water and sriracha sauce, then stir in black beans and 1/2 cup cheese, and remove from heat
Fill peppers with meat mixture, bake for 10 minutes, or until peppers are slightly soft, then top with remaining 1 1/2 cups cheese, and bake until cheese is melted.
Top with chopped cilantro, if desired