Preheat oven to 300 degrees. Mix cake mix, 1 stick butter, 1 egg and pecans together; consistency will be similar to cookie dough. Line an ungreased 13x9-inch pan with this mixture.

In another bowl, mix together the cream cheese, 2 eggs, powdered sugar and 1 stick butter until smooth. Pour on top of mixture in pan. Bake for about 1 hour.

Chocolate Chip Park Avenue Cake: Add a 6-ounce bag of semisweet chocolate mini-morsels to the dough in the bottom of the pan; substitute chocolate-flavored powdered sugar for regular powdered sugar.

Lemon Park Avenue Cake: Use a lemon-flavored cake mix instead of butter cake mix; substitute lemon-flavored powdered sugar for regular powdered sugar.

Butter-Fudge Park Avenue Cake: Use a butter-fudge-flavored cake mix instead of butter cake mix.

Per serving (excluding unknown items): 2031 Calories; 153g Fat (66% calories from fat); 38g Protein; 137g Carbohydrate; 857mg Cholesterol; 1064 mg Sodium