In a medium bowl, mix dry ingredients. Add butter chunks and work in with a pastry blender until butter is the size of peas. Mix yolk and 2 Tbl of cream in a small bowl. Add to flour and butter mixture. Mix until dough forms in clumps, adding more cream if necessary. (Can be made in a food processor) Press evenly in 9x13 pan (glass preferred) Bake at 350* 15-20 mins. until pale golden. Let crust sit and cool a bit while you make filling. Maintain oven temp.
In a med bowl, whisk together flour, sugar, salt, eggs, butter and extracts until well blended. Stir in coconut and nuts. Spread evenly over crust. Bake until golden, 20-25 mins. Cool about 30 mins then cut into bars or squares. (I cut into 35 small squares.)