Greens Grilled Cheese

Ingredients

• 1 bunch dark leafy greens, such as kale or chard
• 1/2 lb. Brussels sprouts
• 1 large handful baby spinach
• 2 Tbsp. extra-virgin olive oil
• 3 garlic cloves, minced
• Pinch of red pepper flakes
• 1 tsp. kosher salt
• 1/4 tsp. ground black pepper
• 1 Tbsp. apple cider vinegar
• 8 slices whole grain or sprouted grain bread
• 8 slices mild melting cheese, such as provolone or havarti
• 2 Tbsp. softened butter