Preheat the oven to 375°. Grease a 7" x 9" baking dish.
To prepare the cauliflower cheese sauce, bring a large pot of water to boil. Add the cauliflower and boil for 15 minutes, until tender.
While the cauliflower boils, prepare the pasta according to the package's instructions.
When the cauliflower is done, drain it and place it in a blender. Add the remaining sauce ingredients and blend until smooth.
Place the cooked pasta in a large bowl. Stir in the sauce (depending on the type of pasta you may not use all of it) and the kimchi. Transfer the mixture to the baking dish and sprinkle the breadcrumbs on top.
Bake for 25 minutes, until the top is golden. Remove from the oven. Drizzle the gochujang paste on top and sprinkle with chives. Serve warm.
Recipe by The Colorful Kitchen at https://thecolorfulkitchen.com/2017/04/24/cauliflower-kimchi-mac-n-cheese-vegan-gluten-free/