Heat your oven to 375° and line a muffin tin with baking cups.
Mix together the white sugar and the two tablespoon dark brown sugar and set aside.
In a medium bowl, combine the flour, sugar, baking powder, chocolate chips and kosher salt. In a small bowl whisk the egg, vanilla, grapeseed oil and milk. Pour the wet ingredients into the dry and mix by hand until all ingredients are incorporated.
Fill the cups two-thirds of the way and sprinkle with the sugar mixture.
Place the muffin tin on the middle rack of your preheated oven and bake for 18-20 minutes.
Check mine at the 15 minute mark. The muffins are done when a cake tester comes out clean. Each oven is different, so watch these carefully.
Let cool for a minute before removing. Serve while still warm!