Preheat oven to 350° F, grease or line a 9 × 5 loaf pan with parchment paper. Place oven rack in center of oven.
In a large bowl, whisk together melted butter, vegetable oil, pumpkin, eggs, yogurt, brown sugar, maple and vanilla until smooth.
¼ cup unsalted butter, ¼ cup vegetable oil, 1 ½ cup pumpkin purée, 2 large eggs, 2 Tablespoons plain Greek yogurt, 1 cup packed brown sugar, 2 Tablespoons maple syrup, 1 teaspoon vanilla extract
In another bowl, whisk flour, pumpkin pie spice, cinnamon, baking soda, baking powder, and salt.
1 ¾ cups all-purpose flour, 1 teaspoon pumpkin pie spice, 2 teaspoons cinnamon, 1 teaspoon baking soda, ½ teaspoon baking powder, ½ teaspoon salt
Combine: Stir dry ingredients into wet until just combined. Fold in chocolate chips.
1 cup semisweet chocolate chips
Spoon batter into a greased or parchment-lined 9 × 5 loaf pan. Sprinkle a few extra chocolate chips on top.
Bake at 350° F for 55–65 minutes, until a tester comes out mostly clean, a little melted chocolate is fine.
Let cool in pan 10 minutes, then transfer to a rack. Allow to cool completely then slice.