Beautiful Blueberry Cobbler - cooking recipe

Ingredients

2 1/2 - 3 cups frozen blueberries (or fresh, but frozen work a bit better)
2/3 cup sugar
2 tablespoons cornstarch
3 tablespoons lemon juice
3 tablespoons water, plus 1/2 cup, divided
1 pinch salt
13 -16 ounces yellow cake mix (or two boxes of jiffy yellow cake mix)
1 egg
1/2 cup butter, plus
3 tablespoons butter, divided
2 teaspoons cinnamon sugar

Preparation

Preheat oven to 350 degrees.
In a medium saucepan, mix sugar, salt and cornstarch until smooth. Add lemon juice and 3 tablespoon water, stir well. Stir in blueberries carefully. Bring to a boil over medium heat and cook, stirring constantly until sauce thickens, about 3 minutes. Be careful not to crush blueberries.
Melt a stick of butter and spread evenly in bottom of 9\"x13\" dish. Pour 1/2 of one box of dry Jiffy cake mix over butter. Pour blueberry mixture over dry cake mix. Mix the second box of Jiffy cake mix as directed (1 egg plus 1/2 cup water). Pour prepared cake mix over blueberry mixture. Use the last 3 tablespoons of butter to dot the surface of cake mix to help brown. Sprinkle cinnamon-sugar on top.
Bake 25-35 minutes, or until golden brown on top. Serve with whipped cream and/or ice cream.