Preheat the oven to 350°F. Thoroughly grease a 10-12 cup bundt pan and set aside. (You can grease with melted shortening, baking spray, or softened butter + flour).
Whisk together dry ingredients.
2 1/4 cups all purpose flour, spooned and leveled, 2 tsp. pumpkin pie spice, 1 tsp. baking powder, 1 tsp. baking soda, 1 tsp. salt
Using the paddle attachment on a stand mixer, beat the sugars and eggs for 3 minutes on medium speed until light and fluffy in color.
1 1/2 cups dark brown sugar, packed, 1/2 cup granulated sugar, 4 large eggs, room temperature
Add pumpkin, oil, and vanilla and beat until combined.
1, 15 oz. can 100% pure pumpkin puree, 1/2 cup canola or vegetable oil, 1 Tbsp. pure vanilla extract
Gradually add the dry ingredients, alternately with the sour cream, beginning and ending with the flour mixture, beating until just combined after each addition. Turn off the machine.
1/3 cup sour cream, room temperature
Fold in the chocolate chips (leaving that excess flour behind that you tossed them in)
1 cup mini chocolate chips (toss in a little flour)
Pour into prepared pan, tap on the counter to release any bubbles.
Bake 40-50 minutes, or until a toothpick inserted in the center comes out clean (a few moist crumbs are ok, but it shouldn’t be goopy).
Cool for 10-15 minutes and then loosen cake from the sides and invert the cake onto a wire rack placed over a parchment paper lined rimmed baking sheet. Let cool completely.
Make the frosting: Using a hand mixer, beat all ingredients together until smooth. Adjust consistency if needed, adding more milk for a thinner frosting, or more powdered sugar for a thicker frosting. I like a thicker frosting for this cake.
2 2 1/2 cups powdered sugar, 4 oz. full-fat cream cheese, softened, 3-4 Tbsp. whole milk, 1 tsp. vanilla, pinch of salt
Leave cake as is or garnish with whatever you'd like. ENJOY!
for finishing: more mini chocolate chips, flaky sea salt, pumpkin pie spice, etc.