Triple Berry Crumble - Taylor Likes

Ingredients

• 1 cup old-fashioned rolled oats
• 1 cup gluten-free flour
• 1/4 cup granulated sugar
• 3/4 cup light brown sugar
• 2 teaspoons ground cinnamon
• 1/4 teaspoon salt
• 2/3 cup melted salted butter
• 1 teaspoon vanilla extract
• 4.5 cups frozen blackberry-raspberry mix
• 1/4 cup oat flour
• 1 teaspoon lemon juice