Set the oven to 400 degrees Fahrenheit. Lay your pie crust dough on a piece of parchment paper and use a rolling pin to roll it into a 12” diameter circle. Transfer the parchment paper with the dough circle onto a rimmed baking sheet.
Ina large mixing bowl, add 2 tablespoons of the sugar, cornstarch, and salt and stir to combine. Add the lemon juice and zest and stir until well mixed. Add the blueberries and stir until they are coated in the lemon/sugar mixture.
Spoon the blueberries onto the center of the pie crust dough, leaving a 2-inch border around the outside. Fold the outside edge of the pie crust dough up and over the edges of the filling.
Crack the egg into a small dish and add the tablespoon of water. Use a fork to beat them together until combined into an egg wash. Use a pastry brush to paint the egg wash over the folded crust dough (you will not use anywhere near all of it, just discard whatever remains). Sprinkle the two teaspoons of sugar all over the egg washed crust and the blueberries in the center of the galette.
Place the baking sheet in the heated oven and bake for 30-40 minutes until the crust is golden and the blueberries are hot and juicy. Transfer the parchment with the galette onto a cooling rack and let it cool for 20-30 minutes before slicing into 8 equal slices.
Notes
To view your current WW Points for this recipe and track it in the WW app, click here!WW Points per (1/8th) slice: 6* (SP calculated using the recipe builder in the WW app)*or 7 Points per slice if following the diabetic WW planNutrition Information per (1 slice = 1/8th of the galette) serving: 170 calories, 27 g carbs, 11 g sugars, 7 g fat, 3 g saturated fat, 2 g protein, 2 g fiber, 135 mg sodium (from myfitnesspal.com)Weight Watchers Points Plus: 5 per (1 slice = 1/8th of the galette) serving (PP calculated using a PointsPlus calculator and the nutrition info)