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Combine the flour and baking powder in a mixing bowl.
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Add the granulated sugar, vanilla sugar, salt, cinnamon, and lemon zest. Stir until evenly combined.
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Add the butter in small pieces. Using your hands, work the butter into the dry ingredients until a crumbly dough forms.
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Do not knead the mixture for too long. You want a combination of small and larger crumbs rather than a smooth dough.
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Add the Crumble Topping
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Scatter approximately two-thirds of the streusel loosely over the fruit filling.
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Do not press down on the crumbs or create a very thick, compact layer. A looser layer allows the heat to circulate and helps the topping bake more evenly.
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Spread the remaining streusel in a single layer on a small parchment-lined baking sheet or in a separate small baking dish.
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Bake the Crumble
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Place the crumble in the preheated oven and bake for approximately 40 to 45 minutes. The fruit filling should be bubbling around the edges and the streusel should be golden brown.
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Check the separately baked streusel after approximately 15 to 20 minutes. Remove it from the oven as soon as the crumbs are golden and crisp.
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Let the finished peach crumble rest for 10 to 15 minutes before serving. This gives the fruit filling time to thicken slightly.
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Sprinkle the separately baked streusel over the crumble immediately before servin