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Place the Mini Eggs in a sandwich bag, seal it, and gently smash them with a rolling pin or meat hammer until they’re roughly crushed.
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Preheat the oven to 175°C (350°F). Line a 9-inch square baking pan with parchment paper (leave enough overhang to remove the blondies easily).
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In a medium saucepan, melt the butter over medium heat. Once melted, remove it from the heat and let it cool slightly.
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Add the brown sugar and granulated sugar to the melted butter and whisk until well combined (2-3 minutes). Whisk in the egg and vanilla extract until fully incorporated, then add the sourdough discard and stir just until combined.
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Whisk together the flour, baking powder, cornstarch, and salt in a separate bowl.
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Gradually add the dry ingredients to the wet mixture, stirring until just combined. Fold in the chocolate chips & cadbury mini eggs.
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Pour the batter into the prepared baking pan and spread it evenly. Sprinkle a few more cadbury egg pieces over top if desired.
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Bake for 25-28 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs (but not wet batter).
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Allow the blondies to cool completely in the pan before cutting them into squares. Enjoy!
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Cadbury mini egg sourdough blondies can last 2-3 days on the counter wrapped tightly or in an airtight container.