1 cup (250 ml) melted salted butter
2 cups brown sugar
3 teaspoons vanilla extract
2 large eggs, beaten
1/4 teaspoon salt
2 cups all-purpose flour
1 cup chocolate chips
Line 4-6-quart (4-6 l) slow cooker with aluminum foil.
In a large mixing bowl, combine melted butter and brown sugar. Stir well, then add vanilla extract and beaten eggs and mix until smooth. Stir in salt and all-purpose flour.
Pour the batter into the bottom of foil-lined slow cooker. Sprinkle chocolate morsels on the top. Place piece of paper towel on the top and close the lid.
Cook on high- heat setting for 2½-3 hours or until toothpick inserted in the middle of bar comes out clean.
Turn off the slow cooker and open the lid. Remove cooked bars and transfer to a serving plate. Cool for 1 hour before cutting and serving.