Step 2: Transfer to blender and puree. Then pour back into saucepan through a fine mesh sieve.
Step 4: Combine butter, brown sugar, vanilla, egg, and egg yolk. Stir with a whisk to combine.
Step 5: Fold in flour, baking powder and salt just until combined.
Step 6: Fold in chopped white chocolate.
Step 7: Transfer batter to prepared 8x8-inch pan. Use an offset spatula to spread in an even layer.
Step 8: Drop the raspberry sauce by tablespoonfuls on top. Drag a knife through the raspberry sauce to create swirls.
Step 9: Bake in 350° oven for 25-27 minutes or until the edges are just beginning to brown. Slice into squares.