Heat the oven to 350 F and spray an 8×8-inch baking pan with non-stick spray.

In the work bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, combine the flour, baking powder, baking soda, salt, sugar, butter, egg, egg yolk, and vanilla. Mix until it just forms a cohesive mass then add the chocolate chips and stir until they are evenly distributed. Press this mixture evenly into the prepared pan.

In the same bowl combine the cream cheese, butter, egg, flour, vanilla, and powdered sugar. Mix until very smooth and creamy, then stir in the crisp rice cereal, coconut, and chocolate chips until well mixed.

Spread the cream cheese mixture evenly over the base then bake for 25 to 35 minutes, or until the topping is golden brown all over, puffed, and just set at the edges while the center is still just a little wobbly. Cool completely in the pan then chill for at least two hours. Once chilled run a thin knife around the edges of the bars and turn out of the pan. Cut into squares.