preheat oven to 400 and line muffin pan with 12 paper liners.

in large bowl, whisk flour, baking powder, and salt.

in medium bowl, whisk eggs, milk, oil, sugar, orange juice, orange zest.

make well in flour mixture. pour in liquids and 1/2 c. chocolate chips and mix until just combined.

spoon into muffin cups and top with remaining chocolate chips. bake 20 minutes.