Preheat the oven to 350F. Butter and flour your 9 inch tart pan with a removable bottom.
Toss the 2 cups blueberries with the 2 Tbsp granulated sugar, 2 Tbsp lemon juice and 1 Tbsp cornstarch. Mix well, and set aside.
In a food processor process the peeled zest of 1 lemon and 2/3 cup granulated sugar until the zest is competley incorporated and you have a fragrant pale yellow sugar.
In a stand mixer or with electric beaters cream the 1 cup unsalted butterwith the lemon sugar you just made until light and fluffy, about 2-3 minutes, scraping down the sides of the bowl as necessary. Beat in the 1 tsp vanilla paste or extract and 1/4 tsp salt. Note: it's important that your butter be at room temperature. I like to leave it out overnight when I know I'll be baking.
With the mixer on low, slowly add the 2 cups all purpose flour and mix just until there is no dry flour left. Don't over beat but do make sure all the butter is incorporated.
Take 2/3 of the dough and pat it into the bottom of your tart pan. I like to scatter the dough in crumbles across the bottom, and then start to pat it down. It helps to flour your fingers, or use the bottom of a metal measuring cup to tamp it down. Take the time to get the dough evenly distributed. Note: you're not looking to go up the sides of the pan with the dough, just to make an even flat layer. Refrigerate for 10 minutes.
Mix the remaining dough with the 2 Tbsp rolled oats, breaking it apart with your fingers to make coarse crumbles.
Arrange the blueberries on top of the bottom crust. Top evenly with the crumbled dough. Allow some of the berries to show through.
Set the tart pan on a baking sheet, and bake in the preheated oven for about 35 minutes, or until the top is just starting to turn pale golden.
Let the tart cool for 15 minutes on a rack before releasing the bottom from the sides. Finish cooling on the rack.
When cool slice the tart into 8 or 10 slices. Serve as is, or with some lightly sweetened whipped cream.
Notes
I like my fruit and fruit fillings on the tart side, hence the lemon juice. If your berries are tart to begin with, or you just prefer things a bit sweeter, you can reduce or omit the lemon juice.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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