Wash your hands well with soap and warm water for at least 20 seconds.
Add flour, sugar, baking soda, and salt to a medium mixing bowl and mix well. Use a fork to mix until there are no lumps.
Add cereal and mix well. Make a well in the center of the dry mix.
Add egg, buttermilk, and vegetable oil to a small mixing bowl and beat egg mixture until combined. Add egg mixture to the well of the dry mix and stir until all ingredients are moist.
Spray 12 muffin pan cups with vegetable oil cooking spray.
Spoon batter into prepared muffin pan. Fill cups about 2/3 full. Bake for 10-15 minutes until muffins are golden brown.
Store leftover muffins in an air-tight container in the refrigerator.