Homemade Blueberry Pie Filling - cooking recipe

Ingredients

3 pints fresh blueberries
1/4 cup white sugar
1 1/2 tablespoons cornstarch
1 teaspoon ground cinnamon (optional)
1/4 cup water
2 tablespoons cold butter, cut into pieces
1 pint fresh blueberries

Preparation

Cook and stir 3 pints blueberries, sugar, cornstarch, and cinnamon in a saucepan with water over medium-low heat until sugar is dissolved and mixture is slightly thickened, 10 to 15 minutes. Remove saucepan from heat and add butter and remaining 1 pint blueberries; stir gently so blueberries stay whole. Allow to cool.