Recipe(tried): Treebeard's Butter Cake

Here's the Treebeard's Restaurant Butter Cake recipe from the
Chronicle. My sister made this cake and brought it to her office and it was a hit. I haven't tried it myself yet coz i have eaten too much Nan's pound cake!
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Treebeard's Butter Cake

Treebeard's uses only Pillsbury's cake mix; they've found it makes a
big difference, said Dan Tidwell, Treebeard's owner. For home use, he
helped us adapt the recipe to a 13-by-9-by-2-inch pan. If using
ovenproof glass, reduce baking temperature to 325 degrees.

1 (2-layer size) package yellow cake mix (Pillsbury's
pudding-included type).
4 eggs.
1 stick butter (1/2 cup), melted.
8 ounces cream cheese, softened.
1 teaspoon vanilla.
1 pound powdered sugar.

Preheat oven to 350 degrees. Mix 1 slightly beaten egg with dry cake
mix and melted butter to a moist dough consistency. Grease a
13-by-9-by-2-inch pan. Press mixture evenly in pan.
Soften cream cheese (can use microwave), and beat in electric mixer
with remaining eggs and vanilla until creamy. Beat in powdered sugar
gradually, and beat until smooth; this takes several minutes. Pour
over crust. Bake at 350 degrees (325 if using glass pan) 35 to 40
minutes. Watch carefully so base doesn't get too brown.
The cheese mixture sinks into the center somewhat leaving a firmer
crust around the edges. Cut in squares to serve. Some cooks sprinkle
powdered sugar and/or pecans over the top of the baked cake or
garnish it with fresh strawberries.