Tortilla and Black Bean Pie

INGREDIENTS

• 4 flour tortillas (10 inches)
• 2 tablespoons canola oil
• 1 large onion, diced
• 1 jalapeno chile, minced (remove seeds and ribs for less heat)
• 2 garlic cloves, minced
• 1/2 teaspoon ground cumin
• Coarse salt and freshly ground pepper
• 2 cans (15 ounces each) black beans, drained and rinsed
• 12 ounces beer, or 1 1/2 cups water
• 1 package (10 ounces) frozen corn
• 4 scallions, thinly sliced, plus more for garnish
• 8 ounces cheddar cheese, shredded (2 1/2 cups)