Heat oven to 350°. Stir together flour, granulated sugar, baking powder, 1/2 teaspoon pumpkin pie spice and the salt in medium bowl. Stir in pumpkin, oil and milk just until moistened. Spread in ungreased square baking dish, 8x8x2 inches.
Heat apple cider and butter to boiling in 1-quart saucepan over medium-high heat.
Meanwhile, mix brown sugar, cornstarch and 1/4 teaspoon pumpkin pie spice in small bowl. Sprinkle over pumpkin batter in baking dish. Pour boiling cider mixture over all.
Bake 40 to 45 minutes or until top is golden brown and edges are bubbly. Cool 15 minutes. Serve warm.