Heat 2 teaspoons oil in a large nonstick skillet over medium heat. Add onion and cook, stirring often, until softened, 5 to 7 minutes. Stir in bell pepper, corn, garlic, chili powder and cumin; cook, stirring, until fragrant, about 2 minutes more. Transfer to a large bowl; let cool to room temperature, about 10 minutes.
Meanwhile, prepare Fresh Tomato Salsa, if using.
Add pumpkin, cheese, wheat germ, breadcrumbs, parsley, salt and pepper to the onion mixture; mix well. With dampened hands, form the vegetable mixture into six 1/2-inch-thick patties, using about 1/2 cup for each.
Preheat oven to 325°F. Stack tortillas and wrap in aluminum foil. Place in the oven for about 15 minutes to heat through. (Alternatively, stack tortillas between two damp paper towels; microwave on high for 30 to 60 seconds, or until heated through.)
Using 2 teaspoons oil per batch, cook 2 to 4 patties at a time in a large nonstick skillet over medium heat until browned and heated through, about 4 minutes per side. Adjust heat as necessary for even browning. Wrap the patties in tortillas and serve immediately, garnished with lettuce and Fresh Tomato Salsa, if desired.
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