This slow cooker 3-ingredient foil wrapped rhubarb crisps recipe is inspired by the kind of simple, sweet treats a Midwestern grandpa might make from his own spring garden. It uses just three ingredients—fresh rhubarb, a cozy brown sugar-oat topping, and a sprinkle of coarse sugar on top—sealed into little silver pouches that cook up tender and bubbly in the slow cooker. Everything is portioned into individual packets, so they’re easy for family dinners, church potlucks, or nights when you want a warm dessert without fuss. The slow cooker does all the work, and those foil packets feel just special enough to “steal the show” after supper.
Serve these warm rhubarb crisps right out of the foil packets, carefully opening them at the table so everyone gets a puff of that sweet, steamy aroma. They’re wonderful on their own, but a scoop of vanilla ice cream, a dollop of whipped cream, or a spoonful of vanilla yogurt makes them feel extra cozy. Pair with hot coffee or tea for the grown-ups and cold milk for the kids. If you’re stretching dessert for a crowd, add a simple bowl of fresh berries on the side so folks can spoon them over their crisp.
Slow Cooker 3-Ingredient Foil Wrapped Rhubarb CrispsServings: 6
Ingredients
4 cups thinly sliced fresh rhubarb (about 1 pound, trimmed)
1 cup packed light brown sugar, divided
1 cup old-fashioned rolled oats
6 pieces heavy-duty aluminum foil, each about 12x12 inches (for wrapping)
Directions
Prepare the foil: Tear off 6 squares of heavy-duty aluminum foil, each about 12x12 inches. Lightly crimp up the edges a bit so they’ll hold in juices, but keep them flat enough to fold over later.
Make the oat topping: In a medium bowl, stir together 1/2 cup of the brown sugar and the rolled oats until well mixed. This will be your simple crisp topping.
Sweeten the rhubarb: In another bowl, toss the sliced rhubarb with the remaining 1/2 cup brown sugar until the pieces are evenly coated and starting to look a little syrupy.
Fill the foil packets: Divide the sugared rhubarb evenly among the 6 foil squares, piling it in the center of each. Sprinkle a generous spoonful of the oat mixture over the top of each rhubarb mound, using all of the oat mixture between the packets.
Seal the silver pouches: Fold each foil square up and over the filling, bringing opposite sides together and folding them over several times to create a tight seam. Then fold in the ends so each packet is completely sealed. You want them snug so the steam and juices stay inside and the rhubarb gets soft and jammy.
Arrange in the slow cooker: Place the sealed foil packets seam-side up in the bottom of a 5- to 6-quart slow cooker. It’s fine if they overlap a bit. Sprinkle a pinch of extra brown sugar or oats on top of each sealed packet if you’d like a rustic look when you lift the lid.
Cook: Cover the slow cooker with the lid and cook on LOW for 3 to 4 hours, or until the rhubarb inside is very tender and bubbly and the oat topping has softened and absorbed some of the juices.
Serve: Using tongs, carefully lift the hot foil packets from the slow cooker and place them on plates or shallow bowls. Let them sit for a couple of minutes so the steam calms down. Carefully open each packet (watch out for hot steam) and serve the crisp right in the foil or transfer to small dessert bowls.
Variations & Tips
For a milder tartness, swap half of the rhubarb for sliced strawberries or apples while keeping the same simple three-ingredient idea: fruit, brown sugar, and oats. If your family prefers softer texture, slice the rhubarb very thin so it almost melts into a jammy layer; for more bite, cut it into 1/2-inch pieces. Picky eaters sometimes like their own little toppings, so you can keep a small bowl of extra oats and brown sugar on the table for sprinkling after cooking. If your slow cooker runs hot, check the packets at the 3-hour mark to avoid overcooking. These packets also travel well—assemble them ahead, keep them chilled on a tray, then drop them into the slow cooker an hour or two before dinner so dessert is ready when everyone’s finished eating. For easier cleanup, you can lightly spritz the center of each foil square with nonstick spray before adding the fruit, though it’s usually not necessary because of the juices.
