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Preheat oven to 400 degrees.
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Mix first 4 ingredients with hand or stand mixer on medium until softened and well mixed.
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Add next two ingredients and mix on med-low until just incorporated.
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Add spinach and mix on low until just incorporated.
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Transfer mixture to a small ovenproof dish and sprinkling cayenne on top to taste. Top with cheddar.
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Bake for 15 – 18 minutes or until bubbling around the edges. Remove from oven and allow to set for 5 – 7 minutes before serving.