In a small bowl or measuring cup, whisk together the melted butter and brown sugar until you have a thick, grainy syrup. It will look a little sandy, and that’s okay.
Pour the butter–brown sugar mixture evenly over the dumplings in the slow cooker, making sure each dumpling gets some of the mixture. It will melt down into a caramel-like sauce as it cooks.
Cover the slow cooker with the lid and cook on HIGH for 2 to 2 1/2 hours, or on LOW for 4 to 4 1/2 hours. The dumplings are done when the dough is cooked through and puffed, the tops are golden, and the sauce is bubbling and thickened around them.
Once cooked, turn the slow cooker to WARM and let the dumplings sit with the lid off for about 10 minutes to let the sauce thicken slightly and the tops set. This is when the edges get that perfect mix of soft and a little crispy.
Spoon the warm dumplings into bowls, making sure to scoop up plenty of the sticky caramel-like sauce from the bottom of the slow cooker. Serve immediately for the best texture.
To lean into the cozy, spiced pie vibe, you can sprinkle a little cinnamon or apple pie spice over the apples before wrapping them in dough (this technically adds an ingredient, but it’s a nice optional upgrade). If you like a deeper caramel flavor, swap half of the light brown sugar for dark brown sugar. For smaller kids or a crowd, cut the crescent dough triangles in half and use one apple wedge per mini dumpling; reduce the cook time slightly and start checking early. You can also use different apples—Granny Smith will give you a more tart, firm bite, while Gala or Fuji make a softer, sweeter filling. To prep ahead, you can peel and slice the apples a few hours in advance and store them in the fridge tossed with a little lemon juice, then assemble and start the slow cooker right before guests arrive. Leftovers keep well in the fridge for up to 3 days; reheat in the microwave in short bursts, adding a splash of water or cream if the sauce needs loosening. If you want a bit more texture, serve with chopped toasted pecans or walnuts on top (again, optional so you can keep the base recipe to four ingredients).
