Step 1

Heat oil in a medium saucepan over medium-low. Add garlic and cook, turning occasionally, until lightly browned, about 2 minutes. Add kale in handfuls, stirring often and letting each addition wilt before adding the next. Stir in ½ cup water. Increase heat to medium-high and bring to a simmer. Continue to cook, tossing occasionally, until kale is tender and pan is dry (add more water as needed if kale needs more time), about 5 minutes. Transfer kale to a medium bowl; discard garlic, if desired. Stir in sauerkraut, yogurt, and hot sauce; season with salt. Wipe out skillet.

Step 2

Divide kale mixture between 2 slices of bread. Top kale mixture with both cheeses. Close sandwiches with remaining bread, then spread 1 Tbsp. butter on top slices.

Step 3

Heat reserved skillet over medium-low. Add sandwiches buttered side down and press down gently with a pan lid. Butter top sides of sandwiches and cook, turning sandwiches once, until golden brown and crisp and cheese is melted, about 4 minutes per side. Transfer to a cutting board and cut in half before serving.