Western desserts - Triple Chocolate Muffin

Triple Chocolate Muffins:

100g butter

¼ cup vegetable oil

3 eggs

½ cup brown sugar

½ teaspoon vanilla

1 cup milk

1 1/2 cups flour

½ cup cocoa

1 teaspoon instant coffee

½ teaspoon baking powder

½ teaspoon baking soda

A pinch of salt

1 cup dark white chocolate

Chocolate spread (optional) for serving