Blueberry Oat Squares - Starbucks Copycat

Total Time
1hr 5mins
Prep 20 mins
Cook 45 mins

These wholesome bars are just like Starbucks blueberry squares (if not better!) My favorite thing about this recipe is the oatmeal base/crumble topping. It is so versatile and makes enough for a generous amount on the top and bottom because c'mon... isn't that everyone's favorite part?! I use this same oatmeal crust recipe with a multitude of different fillings, including swapping strawberries for the blueberries.

Ingredients Nutrition


  1. Filling: In saucepan, bring blueberries, sugar and orange juice to boil; reduce heat and simmer until tender, about 10 minutes. Whisk in cornstarch and boil, stirring, until thickened, about 1 minute. Place plastic wrap directly on surface; refrigerate until cooled, about 1 hour or up to 1 day before using.
  2. Base/Topping: In a large bowl, stir together the oats, flour, brown sugar, salt and baking soda. Cut in the butter to form a crumbly mixture. Reserve 1 1/2 cups of the crumbs, and pat the rest evenly into the bottom of a greased 9 x 13 inch pan.
  3. Spread the blueberry mixture over the base. Crumble the reserved amount of the base/topping over the blueberry mixture.
  4. Bake at 350 degrees F until light golden, about 40-45 minutes. Let cool completely on rack as these cut better when they are fully set. (Make-ahead: Cover and refrigerate for up to 2 days or overwrap with heavy-duty foil and freeze for up to 2 weeks.).
Most Helpful

5 5

There may be a lot of recipes similar to this one out there, but this one is just absolutely perfect! I made the blueberry filling a day and crumb topping a day ahead and then assembled the next day. Turned out great! I love the crumb topping so I made extra just like another reviewer suggested. I made them last night and my husband, 2 boys (2.5 and 4 years old) and I have gone through have the pan already this morning!

4 5

I love Starbucks blueberry oat squares! There's a simple step missing in the recipe where to spread the blueberries onto the base. That's easy to figure out. I used a 16 oz pkg of frozen blueberries. The flavor is right on, although they seemed to have a bit more oat texture than Starbucks. They also wanted to crumble apart. But, hey - I went after the taste and got it. Thanks!

5 5

Yup,extra crumble for such a big pan. Sprinkle in some whole berries for added pop.

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