Steam the cauliflower pieces until fork tender. Blend with a blender (I use a Vitamix) or a hand blender with a pinch of salt and pepper.
Caramelize the garlic, onion, and mushrooms with enough oil to lightly cover the pan and a pinch of salt. A great starting point is 2-3 cloves of garlic, 1 small or 1/2 large onion, and 4-5 mushrooms, but use what you like.
Add desired amount of peas and corn (I typically go heavy on the peas and light on the corn).
Season with as much seasonings as you'd like, adding more based on your taste. Add 1-2 spoonfuls of nutritional yeast, a handful of fresh parsley, and a little extra salt and pepper. Taste and add more if needed.