Preheat the oven to 350º Fahrenheit. Spray a 9x13 baking pan with cooking spray.
In a large bowl, cream the butter and sugar together using a stand mixer or hand mixer.
Add in the eggs and vanilla. Mix well.
In another bowl, mix together the dry ingredients. Then add in the dry ingredients to the wet and mix until combined. The batter will be very thick.
Fold in the chocolate chips.
Spread the batter in the prepared pan and bake the brownies for 25 minutes* or until the edges are golden brown and the bars look slightly puffed all over.
The bars will be very gooey right when they come out of the oven. You can allow them to cool slightly before cutting so you get cleaner slices.
Best served warm with ice cream! Store in an airtight container.
*We like ours brownies to be just a bit underbaked. 25 minutes is perfect for us. If you'd like your brownies a little more done, add another 5 minutes.The calories shown are based on the bars being cut into 20 pieces, with 1 serving being 1 bar. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate.