Review all recipe notes and instructions before beginning.
Select “Saute” mode on the Instant Pot. Add the butter and stir until melted.
Turn the pot off. Add the stock, hot sauce, salt, garlic, onion powder, ground mustard, pepper, and pasta. Stir until combined.
Add in the broccoli and carrot on top of the pasta. Do not stir. These should be sitting on top of the pasta mixture.
Secure the lid and switch the valve to sealing. Select “Pressure Cook” and “High” on the Instant Pot. Set the timer for 5 minutes. Release the pressure immediately after the timer has finished.
Select “Keep Warm” on the pot. Stir in the half and half. The broccoli will begin to fall apart in the sauce.
Stir in the cream and cheddar cheese until completely melted and smooth. Turn the pot off and let stand for 5 minutes before serving so the sauce can thicken