Combine 3/4 cup Chebe mix, 1 cup of brown sugar, oats, and sea salt together in a mixing bowl.
Cut the 3/4 cup of butter into small cubes and mix with oat mixture until it’s crumbly together. You’ve got to get a little messy and really work this together.
You will then press this mixture into the bottom of a 9 x 13 dish.
Mix the blueberries with the cornstarch and then pour over the top of the crust.
Combine the remaining flour, brown sugar, butter, and cinnamon together. Pop in the microwave for 15 seconds to melt the butter a little. Then crumble this topping over the top.