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Rhubarb Oat Muffins

Rhubarb oat muffins made with a buttermilk-soaked oat batter for a moist crumb and visible oat texture. Topped with a simple oat and brown sugar streusel, these whole-grain-style muffins bake up golden with rhubarb pieces in every bite.
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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: 330
Ingredients Equipment Method Notes

Ingredients
  

Muffins
  • 1 cup old-fashioned oats
  • 1 cup buttermilk
  • 1.25 cup all-purpose flour
  • 1 cup brown sugar
  • 1 tsp baking powder
  • 0.5 tsp baking soda
  • 0.5 tsp salt
  • 0.33 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 old-fashioned oats in buttermilk for 15 minutes to soften, keeping the mixture at room temperature while it hydrates.
  2. Preheat the oven to 375°F and line a 12-cup muffin tin with paper liners so the batter can go in immediately.
  3. Whisk together all-purpose flour, brown sugar, baking powder, baking soda, and salt until evenly combined.
Make the batter
  1. Add vegetable oil, egg, and vanilla extract to the oat mixture and stir to combine, until the wet mixture looks uniform.
  2. Pour the wet ingredients into the dry ingredients and mix just until combined, then fold in fresh rhubarb pieces so they stay distributed.
Fill, top, and bake
  1. Divide the batter among muffin cups until evenly filled.
  2. Sprinkle the tops with oats and brown sugar, visible on the surface like a simple streusel.
  3. Bake for 20-22 minutes at 375°F until the muffins are golden and a toothpick comes out clean.
  4. Cool in the pan for 5 minutes before serving, letting the tops set so the muffins release cleanly.

Notes

For best texture, mix the batter only until no dry streaks remain so the crumb stays tender. Store muffins in an airtight container at room temperature for up to 2 days or refrigerate up to 4 days; rewarm 10-15 minutes at 300°F. Freezing is yes—freeze up to 2 months and thaw overnight. If you want a lower-sugar option, reduce brown sugar by about 1/4 cup and expect a slightly less sweet crumb.