Maple Blueberry Pie - Maple from Canada

Ingredients

• 1/2 cup unsalted butter, room temperature
• 1/3 cup maple sugar
• 1/2 cup all purpose flour
• 1 cup quick-cooking rolled oats
• 1/2 cup almond powder
• Pinch of salt
• 4 cups wild blueberries, fresh or frozen
• 1/4 cup maple syrup (preferably amber syrup for its rich flavor)
• 2 tbsp cornstarch
• 2 tbsp water
• Zest of 1 lemon, finely grated
• 1 tbsp maple flakes