How do I perfectly cream the butter to bake the Green Tea Pound Cake at home?

Here goes a very perfect green tea pound cake recipe:-

Ingredients:-

Eggs: 4 eggs, flour: 2 cups, Sugar: 4/3 cup, butter: 2 and half cup,

Green tea powder: 2 tablespoon, Baking powder: 2/2 teaspoon.

Method:-

Now preheat the oven at 340 degrees F. And add cream butter in a bowl. Then add sugar in the butter and mix very well. Now add beaten eggs and stir well. Later sift flour, baking powder, and green tea powder together and add the flour to the egg mixture and pour the batter into a buttered loaf pan. Now, bake in preheated 340 degrees F oven for about 30-40 minutes and serve it.