Preheat the oven to 200°C
Grease 12 muffin cups.
Whisk eggs, brown sugar, vegetable oil, and milk together in a bowl until smooth.
Stir flour, oatmeal, baking powder, baking soda, and salt into wet ingredients to form a batter. Fill the prepared muffin cups with batter.
Bake in a preheated oven until the tops are golden brown and an inserted toothpick comes out clean, about 20 minutes.