Strawberry Rhubarb Crisp Bars

Ingredients

• 1 cup rhubarb, stems trimmed and diced (about 2-3 medium stalks)*
• 1 cup strawberries, hulled and diced*
• 1 tsp lemon zest
• 1 Tbsp lemon juice
• 1 tsp cornstarch, tapioca flour OR arrowroot flour
• 1 Tbsp granulated sugar
• 1 cup rolled oats
• ¾ cup flour
• ½ cup light brown sugar
• ¼ tsp salt
• 6 Tbsp unsalted butter, melted OR olive oil OR coconut oil