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Sauté onion and butter until the onion is transparent.
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Meanwhile, combine the biscuit mix, 1/2 cup of grated cheese, and milk and beat until smooth. This will be sticky.
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Knead 10 times on floured board working in a small amount of flour if it is sticking too much.
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Butter 8 or 9 inch pie pan and also your hands; spread this mixture on the bottom of the pan.
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Combine the cup of grated cheddar and egg. Spread on crust,
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Sprinkle with onion-butter mixture and poppy seeds.
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Bake at 425°F for 20 minutes.
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To serve, cut in wedges.