Preheat oven to 350 degrees. Grease 2 9 inch cake pans with butter or oil.
In a large bowl, beat the butter, sugar, and brown sugar until fluffy, about 3-4 minutes. Beat in the eggs, one at a time, until fully incorporated. Whip in the vanilla, pumpkin, and Greek yogurt. Add the flour, baking powder, baking soda, cinnamon, ginger, cloves, cardamom, black pepper, and salt. With the mixer running, slowly stream in the buttermilk, mixing until just combined. Do not overmix.
Divide the batter evenly between the cake pans. Bake 30-35 minutes until the center is set and an inserted toothpick emerges with just a few moist crumbs. Let cool in the pans for 10 minutes, then run a knife around the edges to release the layers and flip onto a wire rack. Cool completely.
When the cakes are cooled, make the frosting. In a bowl, whip the cream cheese, butter, maple syrup, maple extract (if using), and vanilla on low speed until combined. Add in 4 cups of powdered sugar and mix to combine, then increase the speed to medium high and whip until very light and fluffy. If needed, pour in more sugar 1/4 cup at a time until the frosting is soft and spreadable.
Pull out about 1 cup of frosting. Mix the yellow and red food dyes according to package directions to achieve the desired orange hue.
Place one cake layer on a flat plate or cake stand. Frost the top generously, then add the second layer. Frost all the way around the cake until completely covered. Use a star piping tip to swirl on some pumpkin designs. To make little stems, add more dye to the remaining orange frosting to create brown. You may need other dye colors to achieve this.