Preheat oven to 350˚F. Line a 9x9-inch baking pan with parchment paper. Spray with nonstick spray and set aside.

In a large bowl, stir together melted butter and sugar until combined.

Stir in eggs, salt, baking powder, vanilla extract, and instant espresso powder.

Add cocoa powder and flour, stirring until combined and there are no lumps.

Fold in chopped chocolate.

Add batter to the prepared baking pan and spread into an even layer. It helps to spray a spatula with nonstick spray so the batter doesn't stick and spreads easier! Top with chopped strawberries, slightly pressing them into the batter.

Bake for 35 to 40 minutes, until a toothpick inserted in the center comes out with just a few crumbs.

Cool for 5 minutes in the pan before removing from the pan. Sprinkle with shaved dark chocolate, if desired, before cutting.