Step 1

Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper so that the paper overhangs on two opposite sides. Grease the paper and any exposed parts of the inside of the pan.

Step 2

Place the butter and chocolate in a large microwave-safe bowl. Heat in the microwave at half-power in 30-second increments until the butter has melted and the chocolate melts when stirred. Set aside to cool slightly.

Step 3

Whisk together the flour, cocoa powder, and salt . Set aside.

Step 4

Place the sugar, eggs, and vanilla in a mixing bowl, and mix well.

Step 5

Add the sugar mixture to the chocolate mixture, and mix well. Then add the flour mixture, and mix until combined.

Step 6

Stir in the chopped strawberries.

Step 7

Transfer the batter to the prepared pan, and spread evenly. Dollop the jam over the top of the batter, and use a thin knife to swirl into the brownies. If you like, place more strawberries on top of the batter.

Step 8

Bake for 35 to 40 minutes, or until a pick inserted into the center comes out with a few crumbs.

Step 9

Place the pan on a wire rack, and allow the brownies to cool completely. Use the overhanging lining to lift the brownies out of the pan and onto a cutting board to cut into squares. (These are fudgy, gooey brownies, so you may want to refrigerate the brownies briefly before cutting them.)