For Crust:
2 cups graham cracker crumbs
3 tablespoons sugar
4 oz soft unsalted butter
1 teaspoon salt

For Filling:
1/3 cup sugar
1/4 cup brown sugar, packed
1/3 cup cornstarch
1/4 teaspoon salt
3 cups whole milk
3 large egg yolks
1 vanilla bean, split lengthwise (or 2 teaspoons vanilla extract)
1/2 teaspoon cardamom
2 tablespoons unsalted butter, cold and chopped roughly
For Topping:
6-8 bananas
1/2 cup semi sweet chocolate chips
1 cup, plus 3 tablespoons heavy whipping cream
1 tablespoon, plus 1 teaspoon sugar
1 teaspoon vanilla extract