Add the cauliflower florets, chopped butternut squash, and 4 cups vegetable broth to your Instant Pot. Secure the lid and set the Pressure Release to Sealing. Select the Pressure Cook setting at high pressure and set the cook time to 4 minutes.
Once the 4-minute timer has completed and beeps, perform a quick pressure release by carefully switching the Pressure Release knob from Sealing to Venting.
Open the pot and transfer the vegetables to a blender. Reserve 1 1/2 cups of the cooking broth. Add 1 1/4 cups to the blender, leaving 1/4 cup to the side.
While the vegetables are cooking, heat the 1/4 cup water in a nonstick skillet over medium heat (alternatively, instead of the water, you can heat 1 tablespoon of olive oil or avocado oil). Once the water is simmering (or the oil is shimmering), add the minced garlic. Cook for 3 minutes, stirring frequently to prevent sticking, until the water mostly evaporates and the mixture is fragrant.
Transfer the garlic mixture to the blender with the cooked vegetables and reserved cooking liquid. Add the nutritional yeast, coconut milk paprika, salt, and black pepper to taste. Blend until the sauce is smooth, thick, and creamy, adding the reserved 1/4 cup cooking liquid as needed to thin out the sauce. Season to taste with additional salt and pepper as needed.
If you have leftovers, transfer them to an airtight container and store in the fridge for up to 1 week. Or you can freeze them in smaller portions for a longer period of time.