Preheat the oven to 350 degrees Fahrenheit.
In a medium mixing bowl, whisk together all wet ingredients.
Whisk in the dry ingredients (aside from the chocolate), making sure to spoon and level the flour, don't scoop right from the bag.
Fold in the chocolate chips. Let the batter rest for about 15 minutes to thicken slightly, this will help ensure really fluffy and tall muffins!
Scoop into a lined muffin tray, filling each to the top.
Top with extra chocolate chips if desired.
Bake for 24-28 minutes or until a toothpick comes out clean.
Let cool in the tray for about 10 minutes, then remove and place on a wire rack to finish cooling before serving.