Step 1: Preheat oven to 350°F (175°C) and line a 12-cup muffin tin with paper liners.
Step 2: In a medium bowl, whisk together flour, baking soda, salt, and pumpkin pie spice.
Step 3: In a large bowl, combine pumpkin puree, vegetable oil, eggs, sugar, and vanilla extract until smooth.
Step 4: Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
Step 5: Gently fold in white chocolate chips.
Step 6: Divide batter evenly among muffin cups, filling each about 3/4 full.
Step 7: Bake for 20-25 minutes until a toothpick inserted in center comes out clean.
Step 8: Let muffins cool in pan for 5 minutes, then transfer to a wire rack to cool completely.