Pecan Pie Upside Down Cake

Topping
Heat oven to 350 °F.
Spray a 9 inch round pan with baking spray.
Combine brown sugar, butter, and corn syrup in a small saucepan.
Heat and stir over low heat until the butter melts and the sugar dissolves.
Remove from heat.
Stir in vanilla.
Spread pecans evenly in bottom of pan.
Pour syrup over top of pecans. Set aside.

Cake
In a large bowl, whisk together flour, sugar, baking powder, and salt.
Add milk, oil, egg, egg yolk, and vanilla.
Whisk until smooth.
Slowly ladle cake batter over top of pecan mixture.
Bake for 45 minutes, or until done.
While the cake is still warm, invert the cake onto lipped cake plate or serving plate.
Remove cake pan and serve.