Preheat the oven to 375°F & Grease your bundt pan
First prepare the vanilla cake batter by combining both flours, sugar, baking soda & salt together in a large mixing bowl. Whisk or sift to combine evenly
Add the vinegar to the plant milk & let it stand to thicken *soy milk is the only milk that will thicken like buttermilk
Melt the vegan butter & then add the oil & vanilla extract
Add all the liquids to the dry ingredients in the mixing bowl & whisk to a smooth batter *about 50 strokes to develop the batter
Next divide the batter into 3 equal parts, using a scale is best to get the exact amount evenly, but you can simply "eye it"
The total weight of the batter is 1260g, so the bowl that gets the chocolate marble should be 400g, the pumpkin marble will be 400g and the vanilla batter should be around 460g
Next combine the cocoa powder with the oil & whisk smooth, then add that to the one bowl for the chocolate batter, whisk smooth
Now add the pumpkin & spice to the other bowl and whisk smooth
Layer the 3 different batters into the greased bundt pan **if you are using a 6 cup capacity bundt pan you will not use all the batter! It will be too much & overflow in the oven! Leave out enough batter to make 4 cupcakes!
Bake in the preheated 375°F oven but immediately turn the temperature down to 350°F upon loading
Bake for 40 minutes then turn the oven temperature down to 300°F for another 20 minutes or when a toothpick inserted into the center comes out with moist crumbs, not raw batter.
While the cake is baking prepare the buttercream recipe of your choice (you will need 3 cups total)
You will then divide the buttercream into 3 bowls to make 1 chocolate & 1 pumpkin & the rest will be vanilla.
You only need about 1 cup of each flavor to ice the cake
Combine the cocoa powder & hot water and whisk smooth but only add it to the portion of buttercream when it is COLD! Whisk smooth
Add the pumpkin & spice to the other 1½ cups of buttercream and whisk smooth
Once the cake is finished baking, cool it in the pan until you can touch it without burning your fingers and turn it out onto a cooling rack to cool to COLD
Decorate with the Calico Shag Decor as shown in the video tutorial