Oat Flour Coffee Cake

This is the classic coffee cake recipe with a yummy streusel topping that I’ve been using forever. I would recommend trying this recipe if you are avoiding white flour. You’ll love the use of oat flour!

Can I make my own oat flour with oats?

Yes! And it’s easy. Pulse the oats in a blender or food processor until they are ground into a powder-like consistency. Done!

Coffee Cake made with oat flour is absolutely delicious and gluten-free. Easy to make!

Buttery, moist cake with flavorful cinnamon streusel filling throughout. This recipe is quick to put together and everyone loves it! Great for a quick weekend brunch item served with a mug of coffee and the crossword puzzle.

Can I use regular all-purpose flour instead of Oat flour?

Yes, absolutely you can!

Is there any coffee in coffee cake?

Nope. The name is kind of stupid. There’s mixed info about if the original coffee cake truly had coffee in it. Most information says no. Either way, coffee cake is simply cake meant to be eaten with coffee. Which, in my book, is still crazy awesome!

Trying to avoid gluten can be very, very difficult at brunch. And, of course, many of the favorite classic coffee cake recipes (like my Buttermilk Blueberry Coffee Cake) uses traditional flours. Obviously a problem for those that are trying to avoid gluten.

I’ve been on a mission to find a way to utilize alternate ingredients in my favorite recipes without making any other changes, if possible.

This recipe, made with oat flour instead of white flour, is simply delicious. And easy. I’m pretty much addicted to making this every weekend. I get to join in on all the carby and delicious treats that are for brunch without the need to have white flour.

Cinnamon Streusel Coffeecake made with oat flour.

The best part? I can make the SAME EXACT recipe with white flour, instead, for the rest of my family. Same one. One pan is oat flour and the other is white flour. Nope, I am not known for sharing mine :).

Why do I make two pans? Oat flour is quite expensive so, if I have time and energy, I’ll make an oat flour version with more nuts and seeds and such in it…for me. And then an AP version with blueberries in it…for them. Saves on the budget, a bit.

The cinnamon streusel:

In my opinion, nothing is more important than the crumble on a coffee cake. It makes the whole thing. Frankly, I usually double the crumble topping on this. And a tip, be sure not to over mix the streusel. You want some larger bits left to be a bit crunchy after baking.

Anyways, give this recipe a try…you’ll be pleasantly surprised at how easy and flavorful it is. Without the need for traditional white flour. Instead, I think the oat flour adds to the oatmeal flavor that good coffee cake already has. Oatmeal, cinnamon, vanilla, and butter are cornerstones of good coffee cake.

Swap out buttermilk for the milk and vinegar. Mixing milk and vinegar together creates a homemade buttermilk that is obviously not needed if you use the real deal.

Classic Coffeecake with cinnamon streusel. Made with oat flour.

Try adding chopped nuts, chocolate chips, dried fruit, or additional spices to amp up the flavor and nutrition.

This coffee cake recipe has it all. Oatmeal, cinnamon streusel, great vanilla flavor, and a buttery cake. It also stores well for several days. Warm it a bit before serving, though, for the optimal coffee cake experience.

Coffee Cake made with oat flour is absolutely delicious and gluten-free. Easy to make!
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4.34 from 9 votes

Cinnamon Streusel Coffee Cake (with oat flour)

A delicious, gluten-free easy classic coffee cake with cinnamon streusel.
Course Breakfast
Cuisine American
Keyword coffee cake, gluten-free
Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
# of servings 9 servings
Calories 358kcal


  • 1 cup milk If you sub buttermilk, skip the vinegar.
  • 1 1/4 tablespoon vinegar If using buttermilk, skip this.
  • 2 teaspoons vanilla extract
  • 3 tbsp oil any mild veggie oil will work fine.
  • 2 cup oat flour (white also works)
  • 1 cup sugar You can use part sugar and part honey, if you like.
  • 1 1/4 teaspoon baking powder
  • 1/2 teaspoon salt
  • 2 tablespoons cinnamon

For the streusel

  • 1/4 cup oat flour
  • 1/3 cup brown sugar
  • 3 tablespoons oatmeal
  • 1/4 cup oil or melted butter.
  • 1 tablespoon cinnamon


  • Preheat oven to 350 F. 
  • Spray an 8 by 8 baking pan and set aside.
  • In a large bowl whisk together the milk, vinegar, vanilla, and oil. Set aside. (the vinegar and milk sitting together will make a buttermilk, skip this if using buttermilk)
  • In a small bowl, stir together the ingredients for the streusel…until crumbly.
  • After the milk mixture has set for about 10 minutes, add the rest of the ingredients (flour, baking powder, salt, cinnamon and brown sugar). Stir just until mixed.
  • Pour batter into the baking pan.
  • Drop the streusel into the pan by the spoonful and use a knife to drag it around, a bit, in swirls. Or, spread it on the top of the batter. (really, how you do your streusel is a personal preference :). Some people even double the streusel and do both the swirl and top)
  • Bake for between 35-45 minutes, checking after 35. It is done when a knife inserted comes out clean. Serve warm, with butter.


Calories: 358kcalCarbohydrates: 52gProtein: 5gFat: 14gSaturated Fat: 1gCholesterol: 2mgSodium: 150mgPotassium: 326mgFiber: 2gSugar: 31gVitamin A: 45IUCalcium: 126mgIron: 1.4mg


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12 thoughts on “Oat Flour Coffee Cake”

  1. hi – this looks awesome.
    Can i use Almond milk instead?
    If I sub out milk with Almond milk do I still need to use the vinegar?

    1. I would use soy milk to create the homemade buttermilk. You need the vinegar to curdle the milk and not all of the nut milks (definitely not coconut) will curdle the same way that soy and dairy milk does. Instead of vinegar you could also use lemon.

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