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Preheat your oven to 425 degrees F. Lightly grease your sheet pan or line it with parchment paper.
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In a large mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, brown sugar, pumpkin pie spice, and cinnamon.
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In a separate bowl, whisk together the sourdough discard, milk, Greek yogurt, pumpkin puree, eggs, melted butter, and vanilla extract until smooth and well combined.
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Pour the wet ingredients into the dry ingredients and gently mix until just combined. Be careful not to overmix, as this can result in dense pancakes. A few small lumps are perfectly fine.
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In a small bowl, mix together the melted butter, brown sugar, cinnamon, and flour until a smooth paste forms.
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Pour the pumpkin pancake batter into your prepared sheet pan and spread it into an even layer.
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Pipe or spoon small spoonfuls of the cinnamon sugar mixture evenly over the batter.
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Using a butter knife, gently swirl the cinnamon mixture into the pumpkin batter, creating a beautiful marbled pattern. Avoid overmixing so the swirls remain visible.
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Bake 10-14 minutes or until golden and puffed (start checking at the 10 minute mark).
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Cool slightly, slice into squares, and serve with maple syrup and butter if desired! They also pair wonderfully with a simple vanilla glaze.
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Storage: Store in an airtight container in the fridge for 4-5 days.