Prep your bell peppers but slicing off the top 1/2 inch. Remove the stem, and dice up the remaining top part and set aside. For the large part of the remaining pepper, discard the membrane.
Select the saute function on the Instant Pot. Once hot, add the oil. Saute the diced onion, garlic, and the diced up top part of the bell pepper. Saute until veggies are tender, about 3-4 minutes.
Add the ground beef and continue to cook for another 3-4 minutes or until mostly browned. Add in the spices, diced tomatoes, apple cider vinegar, and rice. Stir until thoroughly mixed, then add in half of the cheese. Select cancel on the Instant Pot.
Divide the mixture evenly by spooning into each of the 4 bell peppers. Clean out the Instant Pot. Pour 1 cup of water at the bottom of the pot and place the trivet above the water. Arrange the stuffed peppers on top of the trivet (it should fit pretty tightly). Cover and cook on high pressure for 5 minutes.
Use a quick release and remove the lid once he steam has been released. Top with the remaining cheese and fresh cilantro. You can also place the lid back on for about 30 seconds to melt the remaining cheese on top.