Preheat the oven to 350 degrees Fahrenheit.
In a large mixing bowl, whisk together all of the wet ingredients until everything is well combined.
Stir in the dry ingredients (making sure to pour and level the flour, don't scoop from the bag), and mix with a wooden spoon or rubber spatula until well combined.
Fold in the chocolate chips.
Transfer to an 8 or 9 inch square baking pan lined with parchment paper (they will stick without it) and top with additional chocolate chips if desired. These blondies were photographed in an 8 inch pan, so they're thick, but I actually love them a bit thinner so lately I've been using the 9 inch pan! Either works, just depends on your preference.
Bake for 30-35 minutes for an 8 inch pan and about 25-30 for a 9 inch. The top should be golden brown and a toothpick should come out clean. If you like really gooey centers, bake for less time!
Let cool completely before slicing. If they haven't cooled, slicing will get messy!