Baked Oatmeal With Berries

Ingredients

• Nonstick cooking spray
• 1 cup sliced almonds
• 2 cups old-fashioned rolled oats
• 1 tsp. baking powder
• 1 tsp. ground cinnamon
• 1/2 tsp. ground ginger
• 1/2 tsp. kosher salt
• 2 1/2 cups milk
• 2/3 cup maple syrup, plus more to serve
• 1 large egg
• 3 Tbsp. unsalted butter, melted
• 2 tsp. vanilla extract
• 1 cup fresh blueberries, divided
• 1 cup fresh raspberries, divided
• Greek yogurt, to serve