Easter Spring Baking

warning: these cookie bars are highly addictive! 🤤 227g unsalted butter (melted) 300g brown sugar 140g granulated sugar 3 eggs 2 tsp vanilla extract 1 tsp salt 320 g all-purpose flour 1 cup chocolate chips (I used semi-sweet) 1 cup M&Ms, Easter edition 1. Preheat your oven to 350°