How to Make It
Combine onion, vinegar, 1/4 cup water, sugar, 1/4 teaspoon salt, and jalapeño slices in a saucepan over high heat; bring to a simmer. Cook 1 minute; remove from heat, and let stand until ready to serve.
While onion mixture cooks, heat a large skillet over medium-high heat. Coat pan with cooking spray. Add ground beef, chili powder, cumin, garlic, paprika, and remaining 1/4 teaspoon salt to pan. Cook 5 minutes or until browned, stirring to crumble. Stir in oil.
Drain onion mixture. Top tostadas evenly with beef mixture, onion mixture, sour cream, and cilantro.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.