Step 1

Preheat oven to 375°F. Line a muffin tin with 12 muffin liners and spray with oil.

Step 2

Mix flour and baking soda with a whisk in a medium bowl.

Step 3

In a large bowl with a hand mixer, mix and cream the butter and sugar on medium setting for about 2 minutes.

Step 4

In a small bowl, beat the egg whites and vanilla with a whisk, add to bowl with butter/sugar mixture.

Step 5

Mix in the yogurt, then flour mixture and mix on low speed until combined, 1 minute.

Step 6

With a spatula, fold in the chocolate chips and spoon to lined muffin tins about 3/4 filled (I used an ice cream scoop).

Step 7

Bake at 375° or until a toothpick inserted in the center comes out clean, about 16 to 18 minutes. Let cool before eating.