Sheet-Pan Cheesy Korean BBQ Steak Quesadillas | Real California Milk

Ingredients

• 2 tablespoons Real California unsalted butter, plus melted unsalted butter for sheet-pan
• 1 pound beef top sirloin steaks, thinly sliced against the grain
• Kosher salt and freshly ground black pepper, to taste
• 1 large red onion, cut into 1/4-inch slices
• 1 green bell pepper, cut into 1/4-inch slices
• 2 cups prepared kimchi, drained
• 3 green onions, thinly sliced, plus more for garnish
• 1 cup Korean barbecue sauce
• 8 (10-inch) flour tortillas
• 4 cups shredded Real California mozzarella cheese, divided
• 1 cup Real California sour cream
• 2 tablespoons gochujang, plus more for drizzling