Preheat oven to 400 degrees. Line a cooking sheet with parchment paper.
Roll puff pastry on a lightly floured surface to 9x12 size. Place puff pastry sheet onto prepared cooking sheet. Lightly score sheet 1 inch from edge. Be careful not to cut all the way through.
Drain pear halves, reserving juice. Slice pear halves into 1/4-inch slices. Drain on paper towels.
Place whole blueberries into reserved pear juice. Gently smash blueberries with a fork. Stir.
Place pieces of goat cheese inside the partitioned square. Top with pear slices then blueberry pieces. Sprinkle with thyme.
Brush edges with egg wash.
Bake at 400 degrees for 20 to 25 minutes until edges are golden brown and crust is thoroughly baked and not soggy. Cool on wire rack.
Drizzle with honey and sprinkle with lemon zest. Garnish with thyme sprigs and fresh blueberries if desired.