Preheat the oven to 350 °F (175 °C). Place a rimmed baking sheet on a rack in the lower third of your oven. This is on the off chance that something leaks, helps the crust brown better and makes removing the tart from the oven easier. Get out a 9” (23 cm) non-stick metal tart pan with a removable bottom.
In a large mixing bowl, stir together the dry ingredients (flour through salt).
2 cups (250 grams) flour, 1/2 cup (100 grams) granulated sugar, 1/4 cup brown sugar, 3/4 teaspoon baking powder, 1/4 teaspoon salt
Add the vanilla to the melted butter and stir into the dry mixture. Use a wooden spoon to combine it the best you can, then use your hands to bring it together. It’ll look soft and slightly clumpy. It won’t form a smooth ball, but it should hold together when pressed between your fingers.
3/4 cup (50 grams) unsalted butter, melted, 1 teaspoon vanilla extract
Reserve 200 grams (a little less than 1 cup) to use for the topping.
Press the remaining mixture into the tart pan, only going about ½ to ⅔ up the sides of the ungreased tart pan.
Scoop the cherry filling into the unbaked crust and use a spatula to smooth it out. It should not go over the crust on the sides.
Sprinkle the remaining topping over the top of the cherries and very gently press down so no pointy bits are sticking up and will burn.
Very carefully place the tart on the preheated baking sheet and bake for 33-38 minutes or until the topping is clearly baked and turning a very light brown. My filling didn’t bubble at all, and it was fine as the filling was totally pre-cooked. The sole purpose of baking the tart is to bake the crust and topping.
Remove the tart and baking sheet from the oven and place on a cooling rack to cool for 30 minutes or until you can easily remove the tart pan from the baking sheet without burning your hands.
Place the tart pan on the cooling rack to cool for another 1-2 hours. If you’re making the tart the day you plan to serve it, let it cool completely, then cover it loosely with plastic wrap and keep it at room temperature. I wouldn’t put it in an airtight container that first day because trapped moisture will soften the crust and topping faster. For serving on day 2, cover the tart loosely and refrigerate it. The topping will soften some because of the moisture in the filling, but loose covering helps slow that down a bit.