DIRECTIONS
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In a small mixing bowl, cream butter and sugar. Add egg and sour cream; mix well. Combine the flour, baking powder and salt; add to creamed mixture alternately with milk. Fold in blueberries and rhubarb.
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Fill 12 greased or paper-lined muffin cups about two-thirds full. Bake at 400 degrees F for 20-25 minutes or until a toothpick comes out clean. Cool for 5 minutes before removing from pans to wire racks.
If using frozen blueberries, do not thaw before adding to batter.
If using frozen rhubarb, measure rhubarb while still frozen, then thaw completely. Drain in a colander, but do not press liquid out.
Editor's Note: If using frozen blueberries, do not thaw before adding to batter. If using frozen rhubarb, measure rhubarb while still frozen, then thaw completely. Drain in a colander, but do not press liquid out.