Preheat the oven to 350 degrees F
Put paper liners in your muffin cups or lightly grease your muffin tray
Whisk the dry ingredients in a medium to large bowl
Measure the oil and milk into a measuring cup, add the remaining wet ingredients to it and whisk well
Stir the wet ingredients into the dry ones until well combined, small lumps are ok.
Add the chocolate chips if using.
Fill each muffin cup a little over 2/3 of the way full
Bake for 16 to 20 minutes or until a toothpick inserted in the middle comes out clean