Filling: In a large bowl, using electric mixer, beat cream cheese and sugars until smooth. Beat in eggs, one at a time, until just blended. Beat in pumpkin, spices, mild and cornstarch until thoroughly combined. Pour into pan. Bake at 350 degreesF for 50 to 55 minutes, or until center of cake is just set. Remove cake form oven and run knife around sides of pan. Cool at room temperature. Chill, covered, overnight.