Classic Canadian Butter Tarts: A Sweet Slice of Tradition

In a large bowl, combine the flour and sugar. Cut in the chilled butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
Add the egg yolk and mix until just incorporated. Gradually add cold water, a tablespoon at a time, until the dough comes together.
Turn the dough onto a lightly floured surface and knead briefly. Divide the dough into 12 equal portions and press each portion into the cups of a muffin tin to form the tart shells. Chill the dough in the fridge for about 30 minutes.
Make the Filling:

In a medium bowl, whisk together the melted butter, brown sugar, eggs, vanilla, flour, and salt until smooth. Stir in the chopped pecans or walnuts if using.
Assemble the Tarts:

Preheat the oven to 375°F (190°C).
Spoon the filling into the chilled tart shells, filling each about ¾ of the way full.
Bake for 18-20 minutes, or until the filling is bubbly and golden brown. The tarts should be set, but still soft in the center.
Cool and Serve:

Let the tarts cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve at room temperature, and enjoy!
Serving and Storage Tips: