I Googled Blueberry Crumb Cake to find other variations and then saw that this is really Dump Cake. That sounded familiar to me and I looked in my old recipes and saw that I had a Cherry Dump Cake. It's called a Dump Cake because you just dump all the ingredients into the pan that you're using to bake it in. My kind of recipe.
Following is my version of the recipe.
Blueberry Crunch (Dump) Cake1 20 oz. can crushed pineapple (undrained)
4 cups blueberries
3/4 cups sugar
1 box yellow cake mix
1 stick melted butter
1/4 cup sugar
1 cup walnuts chopped (can use pecans or nuts of choice)
Spray or butter bottom of 13 x 9 baking dish
Spread can of pineapple in dish
Mix sugar and blueberries and spread over pineapple
Sprinkle cake mix over blueberries
Drizzle melted butter over the dry mix
Mix 1/4 cup sugar with nuts
Sprinkle over cake mix
Bake at 350 ℉ for 1 hour or until nicely browned.