Cake Batter Blondies

Easy but a little too sweet for me and more cakey and soft than brownie/blondie-ish, but I wanted to make them so I got an opportunity a little over half a month ago. I brought these with me to San Francisco when visiting my boyfriend, so hopefully he liked them but I'm not sure. They're a good quick thing to bake but I think I'd keep searching for a better recipe--or at least find a way to make it denser, maybe with less milk or something.

Cake Batter Blondies
Recipe by Girl Meets Life, found on Sally's Baking Addition

1 box yellow cake mix
1/4 cup canola oil
1 egg
1/3 -1/2 cup milk
1/2 cup sprinkles
1/2 cup white chocolate chips

Preheat oven to 350 degrees. Combine first four ingredients in a large bowl. Add the milk slowly. You want to cake batter to be as dense & thick as possible. Mix in the sprinkles and white chocolate chips.  Pour into 8 x 8 baking pan, sprinkle a few more sprinkles on top, and bake for 28-30 minutes until edges are just turning brown. Allow to cool for at least 30 minutes so the center sets, before cutting into squares.

*The blondies will look like they are not fully done because the center will be quite gooey, but that’s what you want! After about 30 minutes of cooling, they will be easy to cut using a serrated knife.