Stovetop Directions

Cup of Yum
1. In a dutch oven or stockpot, melt butter over medium heat and add diced onion. Sautee for a minute, then add garlic with a pinch of salt; continue sauteing for 2 minutes.
2. Whisk in flour, continuing to whisk for 1-2 minutes to cook the flour down. Whisk in vegetable stock, incorporating with the flour mixture. Add half-and-half, salt, and pepper (to taste), and white pepper. Then add broccoli, cauliflower, and carrot. Simmer - do not boil - for 15-20 minutes until vegetables are just tender enough to be pierced with a fork. 
3. Remove from heat, and stir in shredded cheese in batches. Adjust salt and pepper as your taste desires, and serve! 

Instant Pot Directions:

1. Using the sautee function of your Instant Pot, melt butter and add diced onion. Sautee for a minute, and add garlic with a pinch of salt. Whisk in flour, continuing to whisk for 1-2 minutes to cook the flour down. Add white and black pepper, and an additional pinch of salt. Whisk in 2 cups vegetable stock, incorporating with the flour mixture. Add broccoli, cauliflower, and carrot.
2. Put the lid on the Instant Pot, making it is sealed. Set to high pressure for zero minutes. Once it's come to pressure, carefully quick release the pressure. 
3. While the Instant Pot is working its magic, warm the half-and-half in a small saucepan on the stove.
4. Once you've released the pressure after cooking, stir in half-and-half. Add shredded cheese in batches, stirring to melt in between each addition. Adjust salt level according to taste (since you weren't able to while cooking).