Cook time 30 minutes
Yield: Serves or Makes 9 pop tarts
To make the dough: In a large mixing bowl, whisk together the flour, sugar and salt. Add the cold butter (chopped into dime sized pieces) and mix together with your hands, keeping the butter in their dime size. In another mixing bowl, mix together the egg and milk. Add it to the dough and stir with a wooden spoon until it is well combined. Divide the dough in half and place dough in the refrigerator so that the butter does not melt.
For the filling: In a small saucepan over low heat, add the strawberries, sugar and lemon zest. Keep on low heat, stirring occasionally, until the strawberries start to easily break apart and the sugar is dissolved. Transfer to a blender and blend until smooth. Transfer filling to a mixing bowl and stir in chia seeds. Wait 10 minutes to allow chia seeds to activate and thicken the filling.
To assemble the pop tarts: Place one of the dough halves on a generously floured work surface, and roll it into a rectangle about 1/8" thick and 9x12 inches in size.
Roll the second piece of dough just as you did the first.
Using a bench scraper or knife, cut both of the dough halves into 3x4 inch rectangles. Place a tablespoon of the filling in the center of half of the rectangles, the other rectangles will become the tops of the pop tarts.
Place the other rectangles on top of the rectangles with filling (like a sandwich), and using a fork, press the sides of the dough together around the edges.
In a small mixing bow, whisk together the egg and water to create an egg wash. Lightly coat the top of each of the pop tarts with the egg wash.
Transfer the pop tarts to a baking sheet lined with parchment paper. Place in the oven at 350 for around 30 minutes, or until they are golden brown.
When you are ready to eat/serve the pop tarts, mixing the powdered sugar with 1 tbsp of the filling to create the glaze (only glaze the pop tarts right before enjoying. If glazed the day before serving, the pop tarts will become mushy). Top with however much glaze your heart desires and enjoy!
Store on the counter for 2 days, or place in the freezer to keep for later, for up to a month.