Heat the oven to 350 F. Line the bottom of a 9x13 baking tray with parchment paper and lightly spray the paper with nonstick spray.
Combine the flour, salt and sugar in a food processor. Cut the cold butter into chunks and let the machine run until the mixture forms large chunks. It takes longer than you think it might!
Put the dough onto the parchment paper and press it out with your fingers across the bottom and 1/4" up the sides. Bake 15-20 minutes, until pale but golden.
Make the filling
Melt the butter in a saucepan over medium heat. Cook, stirring almost continuously, about 5 minutes, until golden brown bits form on the bottom of the pan. Remove from the heat and stir in the white and brown sugar, then let it cool 5-10 minutes.
Whisk in the eggs one at a time, then the vanilla. Then stir in the oats, coconut and m chocolate and dried fruit. Pour over the parbaked crust, then bake 15-20 minutes, until just barely set.