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Place the flour, baking powder, salt, 1/2 cup sugar, egg, egg yolk, butter, and lavender in a mixing bowl. Use the dough hook of your mixer or your hands to knead the mixture into streusel.
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Preheat the oven to 350 degrees F. Line a 10-inch baking pan with parchment paper.
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Separate 2/3 of the dough and press it into the prepared baking pan, forming an edge 1/2 inch up the side of the pan.
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Puncture the dough on the bottom of the pan several times with a fork.
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Cover with a layer of baking paper and distribute pie weights on top.*
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Place in the oven and bake for 10 minutes.
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Rinse cherries, drain and remove the stems and pits.
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Remove the pie weights from the pan. Spread the cherries out on the pre-baked dough base.
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Sprinkle vanilla extract and 2 tablespoons of sugar over the cherries.
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Spread the remaining streusel evenly over the cherries.
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Bake in the oven for 30 minutes.
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Remove from the oven. Sprinkle additional dried lavender flowers over the top,
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Let sit 10 minutes, then remove from the pan.
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Transfer to wire rack. Let cool completely before transferring to a serving plate.
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Slice and serve.