Always cook to an internal temperature of 160°F.
Bake: Pre-heat oven to 350°F. Place jalapenos on baking sheet and bake for 25-30 minutes or an internal temperature of 160°F.
Grill: Pre-heat grill to medium high heat. Place jalapenos cut side down and grill untill bacon begins to crisp (about 6 minutes). Flip jalapenos over. Reduce heat to medium-low and cook for an additional 10-12 minutes or until bacon is cooked and cheese is melted.