Preheat oven to 350°. Grease 9x5 loaf pan, preferably light colored.
In a large microwave safe bowl, melt chocolate chips in 30 second increments, stirring between until smooth. Set aside to cool.
1 cup semi-sweet chocolate chips
In large bowl, whisk together the flour, cocoa powder, both sugars, powder, soda, and salt. Set aside.
2 cups all purpose flour, ⅓ cup dark cocoa powder, ½ cup brown sugar, ½ cup granulated sugar, 2 teaspoon baking powder, ½ teaspoon baking soda, ¼ teaspoon salt
Once melted chocolate is cooled, add eggs, oil, yogurt, and vanilla. Combine.
2 eggs, ½ cup vegetable or canola oil, ¾ cup Greek yogurt, 1½ teaspoon vanilla extract
Pour wet ingredients into the dry and combine with rubber spatula until mostly combined with just a few dry pockets and the dough is still shaggy (see photo).
Add in boiling water and stir until water is fully incorporated. Add ¾ cup chocolate chips and fold until combined.
½ cup boiling water, ¾ cup chocolate chips
Pour into greased pan. Sprinkle with extra chocolate chips
Bake for 55-65 minutes until toothpick comes out with a few moist crumbs.
Cool in pan for 15 minutes. Dump and allow to cool on a wire rack.