Crispy Cheddar Cakes with Bacon

INGREDIENTS

• 8 slices bacon
• 1 1/2 cups grated sharp white cheddar cheese (4 ounces)
• 1/2 cup sour cream
• 1 small yellow bell pepper, cut into 1/4-inch dice
• 2 scallions, white and pale-green parts only, thinly sliced
• 1/4 cup all-purpose flour
• 1/2 teaspoon dry mustard
• Coarse salt and freshly ground black pepper
• Pinch of cayenne pepper
• 2 large eggs, separated
• 2 tablespoons vegetable oil, plus more if necessary (optional)