Using electric mixer, beat 1/2 cup butter and 1 cup brown sugar in large bowl to blend. Add 3 eggs and mix well. Beat in almond and vanilla extracts. Sift flour, baking powder and salt into medium bowl. Add to butter mixture and beat until combined. Add whipping cream and beat just until smooth. Fold in chopped macadamia nuts. Divide batter equally among prepared muffin cups. Sprinkle each muffin with whole macadamia nuts.
Bake until tester inserted into center of muffins comes out clean, about 25 minutes. Serve warm or at room temperature.