Preheat oven to 350 degrees F. Lightly spray a 9x13'' pan with non-stick cooking spray.
In a medium bowl combine flour, baking powder, and salt in a large bowl. Separate the eggs into two separate bowls.
Add 3/4 cup sugar to the bowl with the egg yolks and mix on high speed until yolks are pale yellow.
Add the 1/3 cup milk and vanilla and stir to combine.
Pour the egg yolk mixture over the flour mixture and stir gently just until combined (don't over-mix).
Use electric beaters to beat the egg whites on high speed. Gradually add the remaining 1/4 cup of sugar as you mix and continue beating until stiff peaks.
Fold egg whites into the batter gently, just until combined. Pour batter into prepared pan. Make sure to smooth it into an even layer so your baked cake doesn't have divots in it.
Bake for 35 to 40 minutes, or until a toothpick inserted in the center of the cake comes out clean. Remove from the oven and allow the cake to cool completely. While the cake is cooling, prepare the peach filling.
Heat butter in a skillet add peaches and cook for 2 minutes Add piloncillo and pinch of salt. Cook until dissolved about one minute
Take pan away from the flame and add Garrison Brothers bourbon to the pan and return to the flame. Be careful as the bourbon will ignite. After the alcohol has burned off the flame will subside.
Turn flame to medium and allow the liquid to reduce until it coats the peaches. Set the peaches aside and allow them to cool completely, about 15 minutes.
Slice the cake horizontally and carefully remove the top layer and set aside
Soaking Mix for Cake
Combine the evaporated milk, sweetened condensed milk, and whole milk and garrison brothers whiskey in a small bowl.
Once the cake has cooled use a fork to poke holes all over the bottom of the cake. Slowly pour half the milk mixture over the bottom of the cake, making sure to pour near the edges and all around.
Spread cooled peach mixture over soaked bottom of the cake.
Carefully place the top portion of the cake on top of the peach layer and soak the top layer with remaining 3 milk/whiskey mix.
Refrigerate the cake for at least 1 hour or overnight, to allow it to soak up the milk.
In the meantime, whip the heavy cream, sugar and vanilla until stiff peaks form. Smooth over the top of the cake. Sprinkle cinnamon on top.
This recipes is provided courtesy of Alcomar in Austin.