Stroganoff

1 1/2 pounds tofu
2 tablespoons butter, divided
1 medium chopped onion
1/4 pound mushrooms, washed and sliced
1/4 teaspoon salt
1/4 teaspoon pepper
2 tablespoons chives
1/2 to 1 teaspoon garlic powder
1 cup sour cream
1/4 cup tamari soy sauce
1 to 2 tablespoons cooking sherry

Drain tofu on paper towel.

Meanwhile, melt 1 tablespoon of the butter in a large skillet. Saut