Preheat the oven to 350 degrees F. Line 12 muffin cups with liners.
2
Put 1 pkg of cream cheese, 1/4 cup Truvia, and the cornstarch in a large bowl. Beat with electric mixer on low until creamy, about 3 minutes, scraping down the bowl a few times. Blend in the remaining pkg of cream cheese. Increase the mixer speed to medium and beat in the remaining 1/2 cup Truvia, then the vanilla. Blend in the eggs, one at a time, beating well after adding each one. Beat in the cream just until completely blended. Be careful not to overmix!
3
Divide the batter among the 12 muffin cups (fill each one almost up to the top). Place the muffin tin an a large shallow pan, then add hot water so it comes up about 1 inch up the sides of the tin. Bake the cakes until set and the centers are slightly puffy and golden, about 45 minutes. Remove the muffin tin from the water bath and transfer the tin to a wire rack, and let cool for 2 hours. Cover the cakes with plastic wrap (do not remove from tin) and put in the freezer until cold, at least 1 hour.