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Rhubarb Oat Muffins

Rhubarb oat muffins with a soft, moist crumb and visible oat texture, made by soaking oats in buttermilk before mixing. Fold in diced rhubarb, top with a simple oat-brown sugar streusel, and bake until golden.
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Prep Time 15 minutes
Cook Time 22 minutes
cooling 5 minutes
Total Time 42 minutes
Servings: 12 servings
Course: Breakfast
Cuisine: American
Calories: 290
Ingredients Equipment Method Notes

Ingredients
  

Muffins
  • 1 cup old-fashioned oats
  • 1 cup buttermilk for soaking the oats
  • 1.25 cup all-purpose flour
  • 1 cup brown sugar
  • 1 tsp baking powder
  • 0.5 tsp baking soda
  • 0.5 tsp salt
  • 0.333 cup vegetable oil
  • 1 egg
  • 1 tsp vanilla extract
  • 1.5 cup fresh rhubarb, diced
Topping
  • 2 tbsp oats
  • 2 tbsp brown sugar

Equipment

  • 1 sheet pan

Method
 

Soak and prep
  1. Soak the old-fashioned oats in buttermilk for 15 minutes to soften, leaving them visibly moister. Keep the mixture at room temperature while you prep the rest.
  2. Preheat the oven to 375°F and line a 12-cup muffin tin with paper liners, so each cup is ready for batter.
Mix the batter
  1. Whisk together the all-purpose flour, brown sugar, baking powder, baking soda, and salt until evenly combined and no streaks remain.
  2. Add the vegetable oil, egg, and vanilla extract to the oat mixture and stir to combine until smooth.
  3. Pour the wet ingredients into the dry ingredients and mix until just combined, then stop as soon as you no longer see dry flour.
  4. Fold in the fresh rhubarb, diced, so the pieces are evenly distributed through the batter.
Fill and bake
  1. Divide the batter among the muffin cups and sprinkle the tops with the oat-brown sugar topping for visible oat specks.
  2. Bake for 20-22 minutes at 375°F until golden and a toothpick comes out clean from the center.
Cool and serve
  1. Cool in the pan for 5 minutes before serving so the muffins set and lift cleanly from the liners.

Notes

Pro tip: Dice rhubarb into small, even pieces so it bakes into tender bursts without sinking. Store airtight in the fridge up to 3 days, or freeze up to 2 months. No—freezing yes. For a lighter option, use low-fat buttermilk; the texture stays tender but may be slightly less rich.