Cheese Blintz Muffins

1 pound part skim ricotta cheese
3 eggs
2 Tablespoons sour cream or yogurt
1/2 stick butter melted
1/2 cup Bisquick baking mix
1/3 cup sugar
1 Tablespoon cornstarch
1/3 cup warm water
1/3 cup sugar
2 Tablespoons lemon juice
2 cups fresh or frozen blueberries

1. Mix together ricotta cheese, eggs, sour cream or yogurt, butter, baking  mix and 1/3 cup
    sugar.
2. Grease muffin tin.
3. Bake at 350 degrees for 30 minutes (or until lightly browned).
4. In the mean time, combine cornstarch with warm water to dissolve  lumps.
5. Add sugar, lemon juice, and blueberries.
6. Cook over medium heat, stirring until mixture is thickened.
7. Place two muffins on each plate and spoon warm blueberry sauce over  them.
8. Top with a dollop of sour cream.