Caramelize the Onion: Heat the olive oil in a skillet over medium heat. Add the thinly sliced onion and cook slowly until softened and golden brown. Add the minced garlic during the final minute and cook until fragrant.
Prepare the Oven: Preheat the oven to 475°F. Place a pizza stone, pizza steel, or heavy baking sheet inside the oven while it heats. A hot baking surface helps create a crisp, golden crust.
Shape the Dough: Lightly flour your work surface and gently stretch or roll the pizza dough into a round. Leave a slightly thicker border around the edges for a puffy crust.
Add the Pumpkin: Spread the pumpkin puree evenly over the dough, leaving a small border around the outside. Keep the pumpkin layer relatively thin so the pizza doesn't become soggy.
Add the Caramelized Onion: Scatter the caramelized onions and garlic evenly over the pumpkin layer. Distribute them across the surface so every slice gets plenty of flavor.
Add the Gouda: Sprinkle the freshly grated Gouda evenly over the onions. If you enjoy a deeper smoky flavor, use smoked Gouda. Add red pepper flakes for a little heat if desired.
Bake the Pizza: Carefully transfer the pizza to the preheated baking surface. Bake for 10–15 minutes, or until the crust is golden brown and the Gouda is melted, bubbling, and lightly browned.
Rest and Finish: Remove the pizza from the oven and let it rest for a few minutes before slicing. Finish with chopped fresh parsley, black pepper, toasted pumpkin seeds, or a light drizzle of hot honey if desired.