Prep & Preheat. Preheat the oven to 325 degrees F. and line an 8″x8″ metal baking dish with parchment paper.
Brown The Butter. In a small, light-colored saucepan, melt the butter over medium-low heat, stirring constantly. Continue cooking the butter, whisking until the butter begins to foam and brown. It should almost take on the color of honey, and it will smell sweet and nutty. (Get a step-by-step tutorial on how to brown butter here.) Stir In The Chocolate. Remove the brown butter from the heat and immediately stir in the chocolate chips, whisking until smooth, glossy, and totally melted. Set the pan aside to cool slightly.
Whisk Eggs & Sugar. In a medium bowl, whisk together eggs and brown sugar 3-5 minutes, or until the sugar crystals are dissolved (you shouldn’t feel any grit if you rub the mixture between your fingers), and the mixture is slightly lighter in color.
Mix It All Up. Whisk the sugar and egg mixture into the slightly cooled butter and chocolate mixture. Stir in vanilla, then fold in the salt, cocoa powder, and gluten-free flour until just combined. Mix until just combined. Then pour the brownie batter into your prepared pan.
Bake. Smooth the surface with a spatula to get it as even as you can, then bake the brownies at 325 degrees F. for 22-25 minutes or until just almost completely set. (A toothpick inserted in the center will have some moist crumbs but shouldn’t be wet with glossy batter.)
Let the brownies cool to room temperature before you top them with the strawberry and ganache layers.