Crack the 4 eggs into the bowl and beat well on medium speed for 1-2 minutes, or until smooth.
4 eggs
Set a sauce pan over low heat and add the 227g butter. Add the 447g sugar and stir well to combine. Continue to heat just until the mixture is hot (about 110°F to 120°F), but not bubbling. It'll become shiny looking as you stir it.
227 g unsalted butter, 447 g sugar
Add the butter and sugar to the KitchenAid and stir until combined well and smooth.
Add the 177g flour, mix, and then the chocolate chips. Stir until smooth.
177 g all-purpose flour, 340 g chocolate chips
Spoon into the parchment-lined glass baking pan and spread evenly.
Bake in the oven for 28-45 minutes, until done. The edge should be crisp but the middle may look a little soft still, though it should be fully cooked and no longer wet.
Remove from the oven and allow to cool.
Notes
Nutrition is for 16 pieces, a 4x4 grid, but you may want to make them smaller as these are dense, rich brownies.