Line a 5-qt. slow cooker with a piece of aluminum foil, letting ends extend up the side. Lightly spray foil with nonstick baking spray.
In a large bowl, whisk together the sugars, cinnamon and allspice in a large bowl; sprinkle 3 tablespoons sugar mixture in bottom of prepared slow cooker.
Cut biscuits in quarters. Add biscuit pieces to the bowl and toss to coat.
Transfer coated biscuits to slow cooker.
Stir together melted butter and vanilla extract; pour over biscuits.
Sprinkle remaining sugar mixture evenly over biscuits. Using your hands or wooden spoons, gently toss to coat the dough on all sides.
Cook, covered, on low 2-1/2 to 3 hours.
Remove lid and let stand for 10 minutes.
Carefully invert onto a serving platter.
Notes
Makes approximately 6-8 servings.Storage: store in an airtight container in the refrigerator for up to 2-3 days. This recipe is adapted from my Pull-Apart Sticky Cinnamon Bread recipe in my cookbook, The Super Easy Teen Baking Cookbook.