Chocolate Marble Butter Cake

Ingredients:
2 1/4 cup cake flour (minus 2 tbsp if using shifted all purpose flour)
1 tbsp + 1 tsp baking powder
1/2 tsp baking soda
1/4 tsp salt
1/2 cup (1 stick) unsalted butter at room temperature
1/2 cup sugar (add 1/4 cup more if you want it sweeter)
1/3 cup milk
1 1/2 tsp vanilla extract
2 large eggs
3/4 yogurt
2 ounces dark chocolate
1 tsp instance coffee disolve

Yield:
One tube cake

Tool:
Standing Mixer: use paddle attachement.

Methods:
1. Preheat oven at 350F.

2. Sift flour, baking powder, baking soda and salt into a bowl, set a side.

3. Use double boiler, melt chocolate with instance coffee set aside. (make sure get any water drop in. If you ruin the chocolate, try to add 1 tbsp of oil).

4. Cream butter on high speed until soft and creamy, for about 1-2 mins.

5. Slowly add sugar and beat on high speed until all sugar incorporated and texture is light, fluffy and creamy white, for about 6 - 7 mins. Scrape down the side and the paddle often to make sure butter and sugar are well incorporated.

6. Add one egg at a time, make sure each egg is completely incorporated and scrape down the side of bowl. Add yogurt, vanilla.

7. On low speed, add dry ingredients and alternate with the milk. Just mix enough to get them incorporated, do not over mix. End mixing with dry ingredients in last addition.

8. Dive the batter in two bowls. Add the melted chocolate mixture to one of the bowl and stir to combine well.

9. Fill the tube pan with yellow batter, shake the pan to even the batter. Pour chocolate batter in the center at once, use a knife, cut across from center to left and then from center to right. Shake lightly to even the batter.

10. Bake for about 1 hour or insert a toothpick in the center, it should come out clean.