In a large bowl, combine the first seven ingredients, add the sage, mustard and basil, and mix well.
In another bowl, add 4 tbsp of melted butter to the potato, add the egg yolks and mix well. Add to the breadcrumb mixture.
Beat the egg whites until stiff but not dry; fold lightly into bread mixture.
Form the mixture into 8 or 9 balls about 2" in diameter. Place on a greased baking sheet.
Bake in a 350F oven for 30 minutes, then turn up oven temperature to 400F, drizzle remaining butter over the balls and bake a further 10 to 15 minutes, until golden.
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