Preparation

• Preheat oven to 350°F (175°C). Grease and flour an 8x8 inch baking pan or line with parchment paper.
• In a large bowl, whisk together melted butter, granulated sugar, and brown sugar until combined. Beat in eggs one at a time, then stir in vanilla extract.
• In a separate bowl, whisk together flour, cocoa powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
• Fold in the chocolate chips.
• In a small blender or food processor, combine strawberries and sugar. Puree until smooth.
• Pour half of the brownie batter into the prepared pan. Dollop spoonfuls of the strawberry puree over the batter. Swirl gently with a knife or skewer. Pour the remaining brownie batter over the top and swirl again.
• Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached (not wet batter).
• Let cool completely in the pan on a wire rack before cutting into squares.