1. Preheat the oven to 350°F (175°C) and line a muffin tin with paper liners.
2. In a medium bowl, whisk together 1 ¾ cups of flour, 1 tsp of pumpkin pie spice, 1 tsp of cinnamon, 1 tsp of baking soda, and ½ tsp of salt.
3. In another large bowl, combine 1 cup of pumpkin puree, 2 eggs, ½ cup of vegetable oil, ¾ cup of brown sugar, and 1 tsp of vanilla extract.
4. Gradually add the dry ingredients to the pumpkin mixture and stir until just combined.
5. Fold in the chocolate chips.
6. Divide the batter evenly among the muffin cups.
7. In a small bowl, make the streusel by combining ¼ cup of cold cubed butter, ½ cup of flour, ⅓ cup of brown sugar, and ½ tsp of cinnamon. Mix until crumbly.
8. Sprinkle the streusel topping over each muffin.
9. Bake in the preheated oven for 18-22 minutes or until a toothpick inserted into the center of a muffin comes out clean.
10. Let the muffins cool in the pan for a few minutes before transferring to a wire rack to cool completely.
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