Preheat the oven to 450°F and stretch the pizza dough onto a lightly oiled baking sheet.
Stir the pumpkin puree, olive oil, minced garlic, salt, and pepper together in a bowl until combined.
Spread the pumpkin mixture evenly over the dough, leaving a small border around the edge.
Dot the ricotta across the pumpkin layer, then sprinkle the mozzarella evenly on top.
Arrange the sage leaves over the cheese.
Bake for 12 to 15 minutes until the crust is golden and the cheese has melted and bubbled.