Preheat the oven to 400ºF. Line a sheet pan with parchment paper or a silicone mat.
In a large bowl, use a whisk to combine the almond flour, chickpea flour, cornmeal, garlic powder, onion powder, paprika, salt, and pepper. Add the maple syrup, flax egg (or egg replacer), and 2 cups water and gently whisk until a smooth, thick batter forms. If it’s too thick, add more water, a tablespoon at a time to thin it out, if necessary.
Using tongs, or your clean hands, dip a cauliflower floret into the batter until well coated and place on the baking sheet. Repeat with the remaining florets, arranging them on the baking sheet in an even layer.
Transfer to the oven and bake for 10 to 15 minutes, until lightly browned. Remove the pan from the oven and using tongs, gently rotate the florets. Continue baking for 10 to 15 more minutes, until tender but not mushy.
Meanwhile, in a large saucepan, melt the butter over medium heat. Reduce the heat to low, add the hot sauce, and stir until well incorporated.
Remove the sheet pan from the oven and slowly pour the hot sauce mixture over the cauliflower. Gently toss to coat. Continue baking for about 10 minutes more for the flavors to meld. Remove from the oven and let cool slightly.