Blueberry Oatmeal Muffins

"These homemade bakery-style blueberry oatmeal muffins are full of heart-healthy oats, fresh or frozen blueberries, and hints of vanilla and cinnamon. Enjoy these tasty muffins with a hot pot of coffee or tea. Always scoop the flour into the measuring cup with a spoon for accurate measuring. Then, level it off with a table knife, pushing the excess back into the flour canister. Do not overmix the batter as it can make the muffins tough or gummy. Stir just until combined."