Vegan Pizza

Name: Vegan Pizza
Prep time: 10 min
Total time: 1 h
Yield: 4 serving(s)
Ingredients: 1 small head cauliflower, cut into small florets; 1 tbsp. extra-virgin olive oil; 1 tbsp. apple cider vinegar; 1/2 tsp. garlic powder; 1/2 tsp. cayenne pepper; Kosher salt; Freshly ground black pepper; Cooking spray, for pan; 2/3 c. barbecue sauce, divided; 2 (8-oz packages) store-bought pizza dough; 1/2 small red onion, thinly sliced; 1/2 c. vegan mayonnaise; Juice of 1/2 a lemon; 1 tbsp. finely chopped chives, plus more for garnish; 1 tbsp. finely chopped parsley; 1 clove garlic, minced; Kosher salt; Freshly ground black pepper