Preheat your oven to 375 F and spray a muffin tin with non-stick baking spray. Using a large mixing bowl, mix together the oats, oat flour, milled flax and chia seeds blend (if using), almonds, cinnamon, nutmeg, baking powder, salt, almond milk, honey, eggs, melted butter and vanilla until combined. Add in 2 cups of the blueberries and mix together one last time.