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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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To a mixing bowl add the brown sugar, granulated sugar, and the cooled melted butter and whisk until well combined (2-3 minutes).
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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, salt, and cornstarch in a separate bowl.
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Add the dry ingredients to the wet ingredients in two additions, stirring just until combined. Gently fold in the chocolate chips and M&Ms (reserve about 20 grams of chocolate chips and M&Ms to sprinkle over top of the batter).
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Pour the batter into the prepared baking pan and spread it evenly. Sprinkle the reserved chocolate chips and M&Ms over top.
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Bake for 23-26 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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Patriotic sourdough blondies last 2-3 days on the counter wrapped tightly or in an airtight container.