Strawberry Rhubarb Crumble Bars with Buttery Oat Crust

Ingredients

• 1 1/2 cups all-purpose flour
• 1 1/2 cups rolled oats (old-fashioned)
• 3/4 cup granulated sugar
• 1/2 cup light brown sugar, packed
• 1/2 teaspoon fine salt
• 1 teaspoon ground cinnamon
• 1 cup unsalted butter, melted
• 2 cups fresh strawberries, hulled and diced
• 2 cups fresh rhubarb, diced
• 2/3 cup granulated sugar
• 2 tablespoons cornstarch
• 2 teaspoons vanilla extract
• 2 teaspoons fresh lemon juice