Berry and Yogurt Slab Tart

Ingredients

• 2/3 cup coconut oil or unsalted butter (melted, plus more for pan)
• 1 3/4 cups quick-cooking rolled oats
• 1 1/4 cups spelt flour or gluten-free all-purpose flour
• 1/2 cup dark brown sugar
• 1/2 tsp salt
• water (as needed)
• 2 cups plain skyr (thick Greek yogurt, or thick coconut yogurt)
• 2 Tbsp honey
• 1 tsp vanilla extract
• 2 cups berries such as sliced strawberries (raspberries, or a combination)