1Heat oven to 400°F. Line cookie sheet with parchment paper. In medium bowl, stir Bisquick mix and 1/2 cup milk until soft dough forms. Place dough on surface generously sprinkled with Bisquick mix; roll in Bisquick mix to coat. Knead 5 times.
2Press or roll dough into 11x8-inch rectangle. Spread dough with 1 tablespoon softened butter. In small bowl, mix granulated sugar, cinnamon, walnuts and currants; sprinkle over top of dough; press in slightly. Starting with an 11-inch side, roll up dough tightly; seal edge. Cut into 3/4-inch slices. Place slices on cookie sheet. Brush slices with 1 tablespoon melted butter.
3Bake 8 to 10 minutes or until golden brown. Remove from cookie sheet; cool 10 minutes.
4Meanwhile, in small bowl, mix glaze ingredients, adding milk, 1 teaspoon at a time, until glaze is thin enough to drizzle. Drizzle glaze over warm pinwheels. Serve warm.