Preheat your oven to 400F and prepare the cauliflower pizza crust using the recipe here. While the crust is baking, melt the butter or coconut oil in a skillet over medium heat and start to sauté the sliced onion.
After about 20 minutes of occasional stirring, your onions should be soft and golden in color. (If the onions start to stick to the pan, use a splash of water to keep things moving.)
This is about the time your pizza crust should be ready, so pull it out of the oven, and arrange the caramelized onions, Gorgonzola, and a sprinkling of fresh thyme or rosemary on top. Return to the oven to bake for 8-10 minutes, or until the cheese has melted.