Spray a 7 x 11 removable bottom pan with non-stick spray. Roll out puff pastry slightly thinner to a 9 x 13 rectangle. Center in prepared pan, press the dough up the sides of the pan and fold over (or cut off) excess dough. Press in to sides if folded. Place the pan in the freezer to chill while you prepare the rest.Cut plums into ¾ inch slices.
Cut plums into ¾ inch slices.
Mix frangipane ingredients in a mixer.
Remove the crust from the freezer and spread evenly with frangipane (it will expand as it bakes). Set plum slices in three long rows (see pictures).
Bake for approximately 35 minutes until frangipane is set and just slightly golden. Sprinkle sliced almonds around outer 1 ½ inch of tart. Sprinkle coarse sugar on top of almonds. Place back in oven until deep gold, another 5-10 minutes.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.