"Serves 10. Cake stays fresh (covered) at room temperature or in the refrigerator for 4 days. Frost immediately before serving...."
INGREDIENTS
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1/2 cup (1 stick or 115 grams) unsalted butter, softened to room temperature
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3/4 cup (150 grams) dark brown sugar
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2 large eggs
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2/3 cup (170 grams) creamy peanut butter
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1 teaspoon vanilla extract
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1 and 1/4 cup (160 grams) all-purpose flour (are you measuring flour the correct way?)
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1 teaspoon baking powder
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1/4 teaspoon salt
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3 Tablespoons milk
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7.5 oz (1 cup; 213 grams) container marshmallow creme (Fluff)
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8 oz (225 grams) cream cheese, softened to room temperature
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1/2 cup (60 grams) confectioners' sugar
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2 teaspoons vanilla extract
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1/2 teaspoon salt
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8 Reese's Peanut Butter Cups, chopped (optional)