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.
Notes
Melt butter and add brown sugar while the butter is still warm. Make sure to cool this mixture.
Let other ingredients, particularly eggs, come up to room temperature before you add them.
You don’t want to add your eggs to hot butter and sugar or you’ll risk scrambling the eggs.
Don’t overmix blondies; mix by hand instead of mixer for best results.