Preheat oven to 375°F at step 5. Line a large rimmed baking sheet with parchment paper.
In a bowl, beat together cream cheese and sugar until creamy. Add pumpkin puree and pumpkin pie spice.
Unwrap and unroll the phyllo dough. Remove 3 sheets. Keep remaining sheets covered with a towel or plastic wrap (sheets tend to dry quickly). Place one phyllo sheet onto a working surface. Lightly brush with butter. Repeat with remaining 2 sheets. Using a pizza cutter, cut sheets in half long way, creating two long rectangles.
Add some filling to the corner end of the rectangle (see picture), be sure to leave space around the filling. Fold over creating a triangle and press down to close edges so the filling won’t ooze out. Then keep folding over and until all of the dough/filling is used.
Continue with remaining ingredients. Brush tops of turnovers with butter.
Bake 14-16 minutes, or until the turnovers are golden brown.
Cool pastry triangles and dust with powdered sugar.
Leftovers can be stored in an airtight container in the refrigerator. The turnovers can be reheated if desired.