Line a muffin tin with 12 paper liners.
In a large bowl, add 1¾ cups flour, 1 cup packed brown sugar, 1 Tbsp cinnamon, 1 tsp baking powder, ½ tsp baking soda, and 1 tsp salt. Mix gently to combine.
To the dry ingredients add: 2 eggs, 15oz pumpkin puree, ½ cup canola oil, 1 Tbsp milk, and 1 tsp vanilla. Mix until just combined and everything is even, try not to overmix.
Add in 1 cup of pumpkin spice chocolate chips and fold gently into the batter. Reserve some additional chips for the top as desired.
Spoon the batter evenly into the 12 lined muffin cups. They should fill the papers significantly (none of this ¾ full nonesense, go for full cups). This helps get a lovely dome on your muffins.
You can sprinkle extra chips on top, but I prefer to wait until halfway through baking to add them. Waiting keeps the chips from melting and keeps the finished muffins picture-perfect!
Bake for 25-30 minutes or until a toothpick comes out clean.