In a large mixing bowl combine Baking Mix, ground flax, baking powder, baking soda, salt, sweetener and guar gum or xanthan gum. In a separate bowl stir together the yogurt, eggs, half & half, oil or butter and vanilla just until well blended. Gently fold in your blueberries. Spoon batter into a prepared 12 count muffin tin, filling 3/4 full. Combine the 2 tbls of Erythritol and cinnamon and sprinkle over each muffin then top with the chopped nuts. Bake in a 375 degree oven for 18-20 minutes or until golden brown. Let cool for minutes then loosen and remove the muffins. These are so good with a morning cup of coffee. Enjoy!