½cup(50g)chopped walnutsor pecans for a crunchy topping
Mix the wet ingredients: Preheat the oven to 375°F (190°C). Lightly grease an 8 × 8-inch baking dish. In a large bowl, whisk together 1 can pumpkin puree, 1 cup Greek yogurt, ¼ cup maple syrup, 1 large egg, and 1 teaspoon vanilla extract until smooth.
Add the dry ingredients: Stir in 2 cups rolled oats, 2 teaspoons pumpkin pie spice, 1 teaspoon baking powder, ¼ teaspoon salt, and ½ cup raisins until well combined.
Add the topping: Spread the mixture evenly into the baking dish and sprinkle with ½ cup chopped walnuts.
Bake: Bake for 35–40 minutes, or until the center is set and the top is lightly golden. Let cool for 10 minutes before slicing. Serve slightly warm with a dollop of Greek yogurt and, if desired, a drizzle of maple syrup.