Oatmeal Muffins

Oatmeal Muffins are a hearty (if not glamorous) breakfast muffin. Soft and moist thanks to a blend of oil and butter and a splash of buttermilk. Textured with oats, and full of flavor thanks to brown sugar, vanilla, cinnamon and nutmeg.
Be sure to check out the how-to VIDEO at the bottom of the recipe!
Course Breakfast
Cuisine American
Keyword bakery style muffin, breakfast, muffin, oats
Prep Time 15 minutes
Cook Time 20 minutes
Total Time 35 minutes
Servings 12 muffins
Calories 365kcal
Author Sam Merritt


  • ¼ cup melted butter (57g)
  • ¼ cup canola oil may substitute vegetable oil (60ml)
  • 3/4 cup dark brown sugar (150g)
  • ¼ cup sugar (50g)
  • 1 large egg + 1 egg white room temperature preferred
  • 1 Tbsp vanilla extract
  • 1/2 cup buttermilk room temperature preferred (120ml) **click link for an easy buttermilk substitute**
  • 1 cup all-purpose flour (125g)
  • 2 teaspoons baking powder
  • 2 teaspoons cornstarch cornflour in UK
  • 1 teaspoon cinnamon
  • 1/2 teaspoon salt
  • 1/8 teaspoon nutmeg optional
  • 1 cup old fashioned or instant oats* (70g)

Oatmeal Streusel

  • 1 cup all-purpose flour (125g)
  • cup oats
  • 1/3 cup light brown sugar tightly packed (66g)
  • 1/3 cup sugar (66g)
  • 3/4 teaspoon ground cinnamon
  • 5 Tablespoons butter melted


  • Preheat oven to 425F (215C) and line a 12-count muffin tin with paper liners.
  • Combine melted butter and canola oil in a large bowl. Add sugars and stir well.
  • Stir in eggs, vanilla extract, and buttermilk.
  • In a separate bowl, combine flour, baking powder, cornstarch, cinnamon, salt, and nutmeg. Add oats and stir again until combined.
  • Gently stir ingredients together using a spatula until just combined.
  • Divide batter into prepared pan, filling liners 3/4 of the way full.
  • Prepare your streusel topping

Streusel Topping

  • Prepare streusel by whisking together flour, oats, sugars and cinnamon.
  • Pour the melted butter into the mixture and, using a fork, stir until crumbles form.
  • Using your hands, evenly divide streusel over muffin batter, piling the crumbly streusel over the batter and gently pressing the topping into the batter.
  • Transfer to 425F (215C) oven and bake for 8 minutes, then, without opening the oven door, reduce the oven temperature to 350 (175C) and bake another 12 minutes, or until tops are just beginning to turn golden brown.
  • Allow to cool and enjoy!



*Using old fashioned oats will make your muffins overall lighter and slightly fluffier, but you'll have more of a chewy texture from the oats. They're more... noticeable... in every bite. That's not a bad thing, just worth noting!
Using instant oats will make your oatmeal muffins a bit denser (the oats in general will make them more dense than your typical muffin) but I found that, if I had to choose, I preferred the finer texture that resulted from using instant oats.


Serving: 1muffin | Calories: 365kcal | Carbohydrates: 54g | Protein: 5g | Fat: 15g | Saturated Fat: 6g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Cholesterol: 38mg | Sodium: 224mg | Potassium: 69mg | Fiber: 3g | Sugar: 28g | Vitamin A: 500IU | Calcium: 40mg | Iron: 0.9mg