Cut a 1-inch-wide strip from the top of each baked potato. Scoop out pulp, leaving potato shells intact. Mash pulp.
Melt butter in small skillet over medium heat; add shallot and garlic, and sauté 2 minutes.
Stir together pulp, shallot mixture, 1 tablespoon chives, and next 4 ingredients. Spoon into shells, and place on baking sheet.
Bake at 350º for 20 minutes. Sprinkle with remaining 2 tablespoons chives.