Gather all your ingredients and measure them out. This will make the cooking process smoother and faster.
In the Instant Pot, combine 1 lb. of uncooked whole wheat elbow pasta and 4 cups of water. Stir to ensure the pasta is evenly distributed.
Add 1 tsp of salt, 1/2 tsp of pepper, and 1/2 tsp of ground mustard to the pot. This will infuse flavor into the pasta as it cooks.
Secure the lid on the Instant Pot and set it to manual high pressure for 4 minutes. Once the cooking time is up, perform a quick release to release the steam.
Carefully remove the lid and stir in 2 cups of fresh or frozen broccoli florets. The residual heat will cook the broccoli perfectly.
Add 2 Tbsp of grass-fed butter and 1 cup of milk to the pasta and broccoli mixture. Stir until the butter has melted and the mixture is well combined.
Gradually add 3 cups of shredded sharp cheddar cheese, stirring continuously until the cheese is fully melted and the sauce is creamy.
Spoon the Instant Pot Mac and Cheese with Broccoli into bowls and serve hot. Enjoy your delicious, comforting meal!