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Preheat the oven and grease a baking sheet. Heat the oil. Cook the onion and garlic until they're soft. Mix in the beef and cook it until browned. Stir in the salsa, chili powder, salt, and pepper and cook for 10 minutes. Microwave the tortillas until they're pliable. Spoon the beef mixture onto the tortillas and sprinkle with the cheese. Roll up the taquitos and place them on the baking sheet. Coat the taquitos with oil. Bake the taquitos until crispy. Serve the taquitos with sour cream and salsa.
Set the oven to 400°F (200°C), and allow it to fully preheat. Next, line a baking sheet with foil and lightly spray it with nonstick cooking spray. Set it aside for the moment. Add 1 tablespoon (15 ml) of vegetable oil to a large skillet. Set it on the stove, and allow it to heat on medium for 2 to 3 minutes. You can substitute canola oil if you prefer. After the oil has heated for a couple of minutes, add a finely chopped medium onion and a minced clove of garlic to the pan. Allow them to cook for 3 minutes, or until the onions soften. Stir the onion and garlic regularly to ensure that they cook evenly. When the onion and garlic are soft, add ¾ pound (340 g) of lean ground beef to the pan. Break it up with a wooden spoon, and cook the meat until it is browned, which should take 3 to 5 minutes. You can substitute any ground meat that you like, such as turkey, chicken, or pork, for the beef if you prefer. When the ground beef is browned, add ½ cup (130 g) of salsa, 2 teaspoons (5 g) of chili powder, ½ teaspoon (3 g) of salt, and ¼ teaspoon (½ g) of pepper to the pan. Mix well to ensure that the ingredients are well blended and reduce the heat to low. Allow the mixture to cook for another 10 minutes. You can substitute taco seasoning for the chili powder, salt, and pepper if you prefer. Set (10) 6-inch (15-cm) flour tortillas on a microwave-safe plate, and place a wet paper towel over them. Heat the tortillas in the microwave on high for approximately 45 seconds, or until they are soft and pliable. Once the tortillas are pliable, spread ¼ cup (60 g) of the beef mixture over the center of each. Use ½ cup of shredded (50 g) cheddar cheese to sprinkle over the beef on all of the tortillas. You can substitute your favorite cheese, such as pepper jack or monterey jack, for the cheddar. When the tortillas are covered with the beef mixture and cheese, carefully roll up each taquito to close it. Set the taquitos on the lined baking sheet with the seams facing down. Dip a pastry brush in some vegetable oil and lightly brush it over the taquitos. Make sure to coat the tortillas on all of the exposed sides. Once they're coated with oil, place the taquitos in the preheated oven. Allow them to bake for 8 to 12 minutes, or until they're crispy and lightly browned. When they're finished baking, remove the taquitos from the oven. Use tongs to place them on a platter, and serve them with sour cream and/or salsa for dipping.