In a large microwave-safe mixing bowl, melt butter in the microwave in 20 second increments. That helps it melt uniformly, without getting hot .
Whisk in room temperature eggs, one at a time.
Mix in the brownie mix using a spatula. Gently fold the batter to prevent over-mixing.
Grease an oven-safe baking pan. Line it with a parchment base (optional), and pour the batter in. In this recipe, I used a 7-inch springform pan for a 6 quart Instant Pot. Cover the pan loosely with aluminum foil to prevent any excess moisture from dripping in the pan.
Pour a cup of water into the pot, place a trivet and place the cake pan on top. Close the lid and select the CAKE button and press START. Set the timer to 40 mins at high pressure.
Once cook time is over, wait 10 minutes and then release pressure manually. Open the lid once the in drops. Using silicone mitts, remove the cake pan and remove the foil.
Using a plastic knife, go around the edges of the brownie. Release the spring and remove the ring. Let the brownies cool 10 minutes before cutting.
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Notes
Tips for Making Perfect Chocolate Brownies
Room Temperature Ingredients: For best results, remove the eggs and butter from the fridge 30 minutes prior to baking.
Fold not Stir: When mixing the brownie-mix, gently fold it in using a spatula. That prevents over-mixing the batter and reduces air-bubble formation in the batter. That is key for the dense texture of the brownies.
Line the pan: For an easy release of brownies, line the bottom of the cake pan with parchment rounds.
Checking for doneness: If you find that your brownie batter doesn't look cooked at the end of 40 mins, seal it, and put it back for another 5 mins or so, depending on the quantity and how underdone it looks.
Rest before serving: For best results, cool the brownies 10 mins after cooking.
Adding nuts and/or Chocolate Chips: Add these to the dry mix, before mixing with wet ingredients. This prevents them from sinking to the bottom.
Note: The nutrition facts below are my estimates. If you are following any diet plan, I recommend cross-checking with your preferred nutrition calculator.