Add the butter and brown sugar to a medium bowl. Mix together with an electric mixer on high speed until combined.

Add in the flour, pumpkin pie spice and salt and mix together until the mixture resembles large crumbs.

Preheat the oven to 350°F. Line two baking sheets with parchment paper.

In a small bowl, whisk together the flour, pumpkin pie spice, baking soda, baking powder and salt. Set aside.

In a large bowl cream the softened butter and brown sugar together with an electric mixer on high speed for 1-2 minutes until light and fluffy.

Add in the eggs and vanilla and mix on medium speed until pale and fluffy, about 1-2 minutes.

Add in the pumpkin and mix on medium-low speed to combine.

Add in the dry ingredients and mix on low speed just until combined.

Scoop the dough into 8 balls. Add 2 tbsp of streusel to the top of each cookie and place onto a baking sheet.

Bake the cookies for 11-12 minutes.

Let them cool for 10 minutes on the cookie sheet, then transfer the baked cookies to a wire rack to cool completely.

While the cookies cool make the vanilla glaze by mixing the powdered sugar, vanilla extract and milk together in a small bowl until you achieve a drizzle-able consistency.

Once the cookies are cool, drizzle the vanilla glaze over them and serve!