In a small saucepan, melt together the bittersweet chocolate and butter on low heat. Stir and cook just until the chocolate is melted. Remove from the heat.
In a small bowl, sift together the flour, cocoa powder, baking powder, and salt. Stir in the brown sugar.
In a large bowl, beat together the eggs. Add the sour cream, milk, and vanilla and stir until combined. Whisk in the chocolate and butter mixture. Then, add the flour mixture and stir until just combined. Stir in the mini chocolate chips.
Cook according to your waffle iron's instructions. Be sure not to overcook them, or they will be too dry.
Meanwhile, make the syrup: In a small saucepan, heat the cream and corn syrup until barely simmering. Remove from the heat and stir in the chocolate chips. Stir until they're completely melted and smooth. This can be reheated in the microwave, stirring at ten second intervals, until it's heated through.
Serve the waffles with the syrup, and strawberries and whipped cream.