Start with a basic muffin mix with no flavorings.
Fruit is something good to add to the mix. In this recipe, blueberries are used.
Prepare the muffin mix by using the directions on the box.
Once the batter is mixed, add a tablespoon of cinnamon.
Grease a half sheet pan and spread the batter in there. Try and spread it as evenly as possible.
Sprinkle more blueberries evenly across the top. Frozen berries can also be used, this recipe will handle the frozen ones as long as they are not one big clump.
In a separate bowl, mix one cup of brown sugar, one cup of flower and two more tablespoons on cinnamon.
Also add some softened butter and kneed it together until it becomes a crumbly mixture.
After that is done, spread it on top of the muffin mix.
Lastly, pop it in the oven for 20 to 25 minutes with the oven set at 350 degrees.