COOK IT.
Preheat your Pit Boss or pellet grill to 350°F
In a mixing bowl, beat together butter and sugar with an electric mixer. Add in the egg and vanilla extract and mix until smooth and fully combined.
In a different bowl, whisk together flour, cocoa powder, and baking soda.
In a separate bowl combine Coca-Cola and buttermilk.
Start to slowly combine the Coca-Cola mixture, flour mixture, and butter mixture together. Alternating the flour mixture and Coca-Cola mixture until all of the ingredients are fully combined. Fold in mini marshmallows.
Prepare your round 13x9 inch pan by greasing and flouring the bottom and sides. Pour your prepared cake batter into the pan.
Place your pan on the top rack of your grill and bake for 30-35 minutes, rotating occasionally.
While the cake is baking, Make the glaze: Mix 2 cups of powdered sugar, 2 tbsp softened butter, 1 tsp vanilla, and 4 tbsp of milk. Mix until smooth and creamy- Add more milk if you want a thinner consistency.
Once the cake is done pull it off the grill and let it rest for 10 minutes. While the cake is still warm, drizzle the glaze over the top.
To garnish add fresh strawberries or smoked candied pecans, and serve!