Soak or rinse the beef: First, if you've bought your beef from the store, it's likely been coated with red dye. To remove this, soak and rinse your beef. Cut your 3 lbs. beef chuck roast into 2 or more chunks and soak them, changing the water multiple times over about 30 minutes. If you prefer not to rinse your meat, you can skip this step.
Prepare the other ingredients: While your beef is soaking, chop your onion and garlic into very small pieces. Also, prepare and measure out the rest of your ingredients.
Searing the Beef
Sear the beef: Rinse your chunks of beef and pat them dry with a paper towel. Turn your instant pot onto the "Sauté" setting. Heat the inner pot for 30 seconds, add 2 tbsp. of olive oil, and place your chunks of beef in the pot. Brown the first side for about 4 minutes and the other side for 2 minutes. Use a splatter screen to minimize splatter.
Sauté the garlic and onions: Remove your beef from the instant pot and place it on a platter. Add butter and garlic to the inner pot of the instant pot and sauté for 15 seconds. Then, add your chopped onions and continue to sauté for another minute, stirring constantly.
Adding the Rest of the Ingredients
Prepare the pot: Add a cup of cold water to the pot and bring it to a boil, stirring constantly to remove any burned stains from the bottom of the pot.
Add the dry ingredients: Turn off the "Sauté" setting and add your dry ingredients: salt, pepper, Mrs. Dash Season, and beef bouillon.
Return the beef to the pot: Place your seared roast beef chunks back into the instant pot, add a bay leaf, and cover the pot with its lid.
Cook the Roast Beef
Cook the beef: Turn the valve to sealing, press “Pressure Cook” and set the cooking time for 55 – 65 minutes.
Release pressure and shred the meat: Once the roast is done cooking, turn the valve to the vent to release the pressure. Press the "Saute" setting again and saute the meat while shredding it into pieces. If you're not serving the roast immediately, turn off the saute setting and turn on the keep-warm setting.