Heat olive oil in a large skillet over medium heat. Add onions and cook, stirring occasionally, until soft (about 7-8 minutes). Reduce heat to low and continue cooking, stirring frequently to prevent sticking, until they are a deep golden brown (20-30 minutes).
Preheat oven to 425°F. Brush the Caulipower Crust with olive oil.
Spread pumpkin puree evenly over the dough, leaving a border. Top with the caramelized onions, mozzarella, prosciutto and gouda cheese.
Bake for 12-15 minutes, or until the crust is crispy and the cheese is melted.