Walnut & Oat Slab Pie Recipe | King Arthur Baking

Ingredients

• 1 batch All-Purpose Flaky Pastry Dough, chilled*
• 3 cups (339g) walnuts, halves and/or pieces*
• 3 tablespoons plus 1/2 cup (61g) old-fashioned rolled oats, divided*
• 12 tablespoons (170g) unsalted butter
• 1 cup (227g) heavy cream, at room temperature
• 3 large eggs, at room temperature
• 4 large egg yolks, at room temperature
• 3/4 cup (160g) dark brown sugar, packed
• 1/3 cup (104g) maple syrup
• 2 teaspoons King Arthur Pure Vanilla Extract
• 3/4 teaspoon table salt
• 1/2 teaspoon cinnamon