Instant Pot Instructions:

1. Pour water into Instant Pot. Add in the  beef stew meat. Sprinkle the meat with the onion soup mix. 
2. Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set manual/pressure cook button to 20 minutes. When time is up let pot sit for 10 minutes and then move valve to venting. Remove the lid. 
3. Add a half cup of the hot liquid in with the sour cream to temper it.
4. Turn Instant Pot to sauté setting. Stir cornstarch together with 2 Tbsp cold water until smooth. Stir the slurry into the pot to thicken the sauce. Once thickened turn off Instant Pot.
5. Stir in the sour cream mixture.
6. Serve beef and sauce over rice, noodles or mashed potatoes.

Slow Cooker Instructions:

1. Stir water, beef and onion soup mix into slow cooker. 
2. Stir cornstarch together with 2 Tbsp cold water until smooth. Stir the mixture into the slow cooker.
3. Cover and cook on low for 4-6 hours or until beef is tender.
4. Add a half cup of the sauce in with the sour cream to temper it. Stir the mixture into the slow cooker.
5. Serve beef and sauce over rice, noodles or mashed potatoes.