1. Preheat oven to 350 degrees. Line an 8-by-8-inch baking pan with parchment paper, leave overhang for easy pull out.
2. In a stand mixer, beat the butter and sugar together for about 2 minutes until light and fluffy. Beat in egg, followed by almond and vanilla extracts and salt, scraping down the sides of the bowl as needed. Add flour and mix on low speed until just incorporated. Add chocolate chips and mix on low again until combined.
3. Press dough into prepared baking pan in an even layer. The dough is sticky so it helps to use a piece of plastic wrap to press down the dough evenly in the pan.
4. Bake for 28 to 30 minutes or until top is puffed and the edges are just starting to turn a very light golden brown. Remove from oven and place on a wire rack to cool completely.
5. Lift out entire block of shortbread using the parchment paper as handles. Cut into bars or squares or whatever makes you happy.