Mix together flour, brown sugar, granulated sugar, butter, vanilla and cinnamon with a pastry blender.
Spread the crumbles in a pan with sides on a silicone baking mat. Bake at 350 degrees for about 10 minutes.
Remove from the oven and allow the streusel to cool for 2-3 minutes.
Use a fork to gently disturb the smooth streusel so that it clumps up. As the streusel continues to cool, periodically use the fork to stir and break apart the cinnamon streusel into crumbles. Store in an airtight container.