Pretty good but too sweet. Next time I will reduce the sugar in the filling portion, at least by 1/3.

Just a correction to the queen of everything domestic. This is not a blueberry "crisp", it is a blueberry crumble. Crisps do not contain oats in their ingredients. Out of all the websites i could go to i would've figured this would be the one place that i could've gone to get the recipe i needed. Very very let down Martha.

This was so easy & delicious. My onl additions were cinnamon & nutmeg to both the blueberries & topping plus 3 tbsp of corn starch so it would not be too runny. Watched the video which was helpful. Want to try this with cherries.

I had my mother over for dinner and made this for dessert. Scrumptious.... I added almonds, sunflower seeds along with the oats for sweet and salty taste. My mother loved it & took home leftovers. Definitely a keeper..

This is just wonderful with a touch of cinnamon. Extremely easy and quick. The vanilla ice cream is a must.

I made this and it's absolutely wonderful. I did not have baking powder and substituted baking soda and it was just fine. The grandkids were asking for seconds. I served it warm with a dollop if vanilla bean ice cream. It was super easy to assemble.

I just want to comment on one of the comments left here. The recipe CLEARLY states which ingredients go into which part (which BTW is only two, lol)...FOR THE FILLING and FOR THE TOPPING are very tough to confuse. I've made this recipe many times and it is a winner. You cannot confuse the ingredients if you READ the RECIPE! Crisps can also have oats in them, that's not specific to crumbles. I add a 1/4 tsp. of cinnamon also, brings out the flavor of the berries. This is a very good recipe.

This recipe is delicious! I used frozen fruit and half mixed berries, half blueberries. I didn't need the lemon juice because of the sourness of the raspberries. Subbed powder for soda, no problem. Made some extra crumble for the top because that's my favorite part. Everyone went back for seconds and thirds-- this is one of my best crumbles. Thanks Martha!

Made it, loved it, everyone who tried it was a huge fan. Omitted the cornstarch because I didn't have any. Subbed baking powder for soda and no issues. Used a bit more oats than called for because they are delish. The serving size is a bit off though. Made 2 8"x8" pans worth of this yummyness.

@Elle2013: When cooked, fresh blueberries sometimes change color. Berries often turn red when combined with acids such as lemon juice or vinegar. In batters containing large amounts of baking soda, blueberries might turn a greenish-blue. These color changes do not affect their flavor. Very happy with this recipe, my only tweak is about a 1/2 t. cinnamon in the topping mix, & I put mine in a graham cracker crust (prebaked has worked well, but the recipe from this website, cooled, is great!)