Combine onions and vinegar in bowl and marinate for 5 minutes. Drain the onions and set aside. Spray a large skillet with non-stick cooking spray, and heat over medium heat. Add onions, and cook until onions have softened, about 5-7 min. Transfer to bowl and set aside. Place tortillas in a large nonstick skillet over medium heat (they will overlap). Warm for about 45 seconds on each side.
It can actually help you cut back on calories. That's because capsaicin, a compound found in jalapeño and cayenne peppers, may (slightly) increase your body's release of stress hormones such as adrenaline, which can speed up your ability to burn calories. What's more, eating hot peppers may help slow you down. You're less likely to wolfed down that plate of spicy spaghetti — and therefore stay more mindful of when you're full. Some great adds besides hot peppers: ginger and turmeric.
Add a cup of low-fat milk, a part-skim mozzarella stick, or a half cup of low-sodium cottage cheese to breakfast, and you may have a belly-busting win. While lots of research links calcium with lower body weights, results from a 2014 study suggest that calcium-containing foods may reduce waist circumference in those genetically predisposed to carrying weight in their midsection.