Vanilla Berry Baked Oatmeal

Name: Vanilla Berry Baked Oatmeal
Ingredients: 1 tablespoon ground flax meal; 3 tablespoons warm water; 2 1/2 cups rolled oats; 1 teaspoon baking powder; 1/4 teaspoon salt; 1 teaspoon cinnamon; 1/2 teaspoon vanilla powder or the seeds of 1 vanilla bean, scraped (or substitute 1 teaspoon vanilla extract); 1/3 cup maple syrup, plus more for serving; 2 1/4 cups almond or soy milk, plus more for serving; 1 tablespoon canola oil or melted coconut oil; 1 1/2 cups fresh mixed berries, plus a few extra for topping; 1/4 cup sliced almonds or chopped pecans; 2 tablespoons organic brown sugar; Jam and/or nut butter, for serving (optional)