In 31⁄2- to 4-quart slow cooker, mix all stew ingredients.
Cover; cook on Low heat setting 7 to 8 hours.
In medium bowl, mix flour, cornmeal, baking powder and 1⁄4 teaspoon salt.
Stir in milk, oil and egg just until moistened.
Drop dough by spoonfuls onto hot lentil mixture.
Increase heat setting to High.
Cover; cook 25 to 35 minutes or until toothpick inserted in center of dumplings comes out clean.