Oatmeal, Carrot, and Apple Breakfast Squares

Ingredients

• Butter, for greasing baking dish
• 1 3/4 cups old-fashioned rolled oats
• 1 1/2 cups (5 ounces) whole-wheat pastry flour
• 1/4 cup ground flaxseed
• 1 tablespoon baking soda
• 1 teaspoon baking powder
• 2 teaspoons ground cinnamon
• 1/4 teaspoon salt
• 1 1/4 cups (11.25 ounces) packed light brown sugar
• 2/3 cup organic canola oil
• 2 large eggs
• 1 1/2 cups low-fat buttermilk
• 1 1/2 cups grated peeled carrots (about 4 medium carrots)
• 1 cup grated peeled apples (2 medium apples)
• 2 cups walnut pieces
• 1/2 cup (2 ounces) unsweetened shredded coconut
• 1/4 cup (scant 2 ounces) packed light brown sugar
• 1 teaspoon ground cinnamon