Add strawberries, water, and vanilla to a small saucepan. Bring to a boil, then lower and simmer until liquid thickens and strawberries are soft, about 15 minutes. Blend slightly using an immersion blender, leaving the mixture a little chunky.

Meanwhile preheat oven to 350 degrees Fahrenheit. Line a nine- by 13-inch baking pan with Gefen Parchment Paper.

Combine all crumble ingredients. Press three-fourths of the mixture into the prepared pan. Spread strawberry filling over crumble. Sprinkle remaining crumble on top. Bake for 30–40 minutes.