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Preheat oven to 315 degrees.
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Grease and flour muffin tins.
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Mix together butter and sugar in a mixer on second speed.
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Add split vanilla bean (or 1 teaspoons vanilla extract) into egg yolks.
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Slowly add yolks, one at a time, to butter/sugar mixture.
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Beat until mixture is a soft lemon color.
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Stir in sour cream and poppy seeds.
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Sift the dry ingredients together and add into egg yolk mixture.
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In a separate bowl, beat egg whites, sugar and cream of tartar until stiff.
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Fold into egg yolk mixture.
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Gently stir in 1-2 pints of fresh raspberries.
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Bake in greased muffin tins for 20-25 minutes.