Preheat oven to 350 degrees and line an 8×8 inch baking dish with parchment paper.

Place butter into a microwave safe bowl and microwave for 30-45 seconds until butter is melted and hot. Add 3/4 cup white chips and let sit for 1 minute. Stir until smooth, if needed place back in microwave for an additional 15-30 seconds to melt through.

Place flour, sugar, chips, baking powder and salt into mixing bowl with melted chocolate. Stir to combine. Stir in eggs and lemon curd and poppyseeds. Stir until well combined. Transfer to prepared baking dish, spreading evenly. Bake for 30-35 minutes, until cooked through. Let cool completely then cut into squares. Serve warm, room temperature or chilled.