Set Instant Pot to "Sauté" and add the ground beef. Cook, stirring often, until beef is crumbled and no longer pink, approximately 5 minutes. Transfer beef to a paper towel-lined plate and carefully drain the fat.
2 lbs. extra lean ground beef
Heat butter and oil and add the diced onion to the pot. Sauté, stirring occasionally, until onion is translucent (about 3 minutes). Add minced garlic, chili powder, cumin, black pepper and salt.
1 tbsp butter, 1 tbsp canola or olive oil, 1 medium sweet yellow onion, 2 cloves garlic, 1 tbsp chili powder, 1 tbsp ground cumin, 1 tsp ground black pepper, 2 tsp kosher salt
Add the chicken stock and water, while scraping the brown bits off the bottom of the pot insert, to deglaze the pan. Turn Instant pot off.
4 cups low-sodium chicken stock, 1 cup water
Add the diced tomatoes with green chilies, diced tomatoes, black beans, kidney beans, pasta and browned beef. Stir, being sure the liquid covers pasta.
1 14.5 oz. canned diced tomatoes with green chilies, 1 14.5 oz. canned diced tomatoes, 1 16 oz. canned black beans, drained, 1 16 oz. canned red or kidney beans, drained, 16 oz. elbow pasta
Lock the lid in place and close the release valve.
Set the Instant Pot to Manual/Pressure Cook on HIGH and set the timer to 4 minutes. When the cook time ends, turn off the pressure cooker and use a quick pressure release. (To reduce splattering, cover the release valve with a lightweight kitchen cloth.) When the red valve drops, carefully remove the lid. Stir the mixture.
Set the pot to "Sauté" and add the milk and 1 cup of cheese. Stir until the cheese melts. Repeat this process until all the cheese has been added. Stir until pasta is tender, approximately 2 more minutes. Add the parsley and stir.
½ cup whole milk, 4 cups shredded Mexican cheese blend cheese, 2 tbsp chopped fresh parsley
Season to taste with kosher salt and black pepper. Enjoy!