In a bowl, whisk together 1/2 tsp garlic powder, 1/2 tsp onion powder, 1/2 tsp paprika, 3 tbsp cornstarch, 4 tbsp all-purpose flour, 1 egg, and 2 tbsp melted butter. Preheat the oven to 450°F.
Add 10 oz cauliflower to the bowl and toss well to coat. Place them on a baking sheet and slide them into the oven to cook for 15 minutes.
In another bowl, stir together 2 tbsp olive oil, 1 tsp brown sugar, 4 tbsp water, 1/2 tsp paprika, 1 tbsp cornstarch, 1/2 tsp salt, 1/4 tsp pepper, 1 tsp Dijon mustard, 2 tsp sriracha and 3 tbsp buffalo sauce. Add the mixture to a skillet and reduce it over low heat for 2 minutes.
Toss the sauce with baked cauliflower nuggets. Place them in a bowl and set aside.
Flip a muffin tray over and tuck 4 corn tortillas into the spaces. Bake at 400°F for 3 minutes. Repeat with the remaining tortillas.
Meanwhile, in another bowl, mix 2 oz green cabbage, 2 oz red cabbage, 2 tbsp whole milk, 1 tbsp sour cream, and 2 tbsp plain Greek yogurt.
Serve the various components in bowls and allow your guests to assemble their own tacos.