Prep: 1. Preheat the oven to 375. Grease a muffin tin, or use paper liners. 2. Combine the oats and milk and vinegar in a mixing bowl. Let the oats soak while preparing other ingredients. 3. Melt butter, let cool. Make: 1. Whisk together the melted butter, egg, brown sugar, and vanilla. 2. Add the flour, flaxmeal, baking powder, baking soda, and salt. Stir again until evenly moistened. 3. Mix in the oat mixture. Fold in blueberries. 4. Pour batter into prepared muffin tin. 5. Bake muffins for 13-15 minutes, or until golden brown.
If you want to go a little crazy with these you can add a crumb topping! Crumble together 1 tablespoon cold butter, 3 tablespoons flour, and 1 tablespoon brown sugar - sprinkle this on the muffins before baking.