Preheat oven to 350°F Grease muffin pan. Set aside.
In a bowl, mix yogurt and baking soda. Set aside.
In another bowl, beat butter. Add eggs, one at a time, then vanilla. Set aside.
In another large bowl, mix flour, baking powder, salt and sugar. Add the egg mixture and then pour the mixture of yogurt, stirring just to moisten the dry ingredients. Incorporate the chocolate chips. Stir a little bit. Pour in the muffin pan.
Mix all ingredients of the garnish. Distribute on the muffins. Bake in oven 30 to 35 minutes. (check the muffins after 20 minutes as I wrote 20-25 minutes as a note, so maybe my muffins were ready after 20-25 minutes. As I said it's been a while since I made them).