Donuts:

1. Preheat your oven to 356°F (180°C) and grease a donut pan with butter or nonstick spray.
2. In a bowl, whisk together the sugar, oil, buttermilk, egg, vanilla extract, and maple syrup until smooth.
3. Add the flour, almond meal, baking powder, and salt, then mix gently until just combined. Do not overmix.
4. Pour the batter evenly into the donut pan cavities, filling about ¾ full.
5. Bake for 12-15 minutes, or until a toothpick inserted in the center comes out clean. Let cool on a wire rack.

Maple Glaze:

1. In a bowl, whisk together the powdered sugar, maple syrup, milk, and vanilla extract until smooth. The glaze should be slightly thick but still pourable.
2. Dip each cooled donut into the glaze, then place on a wire rack to allow the excess to drip off.
3. Sprinkle with crushed nuts or extra toppings, if desired. Let the glaze set before serving.