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Rhubarb Oat Muffins

Rhubarb oat muffins with a tender oat-moistened crumb and visible oat topping. Fresh diced rhubarb bakes into juicy bursts, finished with a simple oat-brown sugar streusel.
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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
  

Rhubarb oat muffin batter
  • 1 cup old-fashioned oats Use for soaking in buttermilk.
  • 1 cup buttermilk Soaks the oats for a softer crumb.
  • 1.25 cups all-purpose flour
  • 1 cup brown sugar Sweetens muffins and batter.
  • 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 cups fresh rhubarb, diced Fold in at the end for visible pieces.
Oat-brown sugar topping
  • 2 tbsp oats Sprinkle on top for texture.
  • 2 tbsp brown sugar Mix with oats for a simple streusel.

Equipment

  • 1 sheet pan

Method
 

Soak, prep, and mix
  1. Soak the old-fashioned oats in buttermilk for 15 minutes to soften, stirring once halfway through. You should see the oats plump as the mixture thickens slightly.
  2. Preheat the oven to 375°F and line a 12-cup muffin tin with paper liners. Set the tray on a sheet pan so it bakes evenly.
  3. Whisk together all-purpose flour, brown sugar, baking powder, baking soda, and salt until evenly combined. Make sure there are no visible baking powder or salt clumps.
  4. Add vegetable oil, egg, and vanilla extract to the oat mixture and stir to combine. The wet mixture should look glossy and uniform.
  5. Pour the wet ingredients into the dry ingredients and mix until just combined, then fold in the fresh rhubarb, diced. Stop mixing once the flour streaks disappear so the crumb stays tender.
Fill, top, and bake
  1. Divide the batter among the muffin cups and sprinkle each with the oat-brown sugar topping. Aim for an even, visible oat layer on top.
  2. Bake for 20-22 minutes at 375°F until golden and a toothpick comes out clean. The tops should spring back lightly when touched.
  3. Cool in the pan for 5 minutes before serving. Letting them rest helps the crumb set for cleaner muffin splits.

Notes

For the moistest centers, mix just until no dry flour remains before folding in rhubarb—overmixing makes the muffins tough. Store muffins in an airtight container in the refrigerator up to 3 days, or freeze up to 2 months. To keep them dairy-free, swap buttermilk for a dairy-free buttermilk substitute (or your favorite plant-based buttermilk) and proceed as written.