Mix the 1 cup flour, 1 ½ tsp baking powder, ½ tsp salt, and 1 tsp sugar in a bowl. Add the ½ cup yogurt and knead for 1 minute into a soft dough. Cover and rest for 10 minutes.

Cook the 1 lb ground beef in a skillet over medium-high heat for 5 minutes until browned. Drain excess fat, then add the 1 tsp chili powder, 1 tsp cumin, ½ tsp garlic powder, ½ tsp onion powder, ¼ tsp smoked paprika, ½ tsp salt, and 2 tbsp water. Cook for 2 more minutes and set aside.

Divide the dough into 4 pieces and roll each into a 6 to 7 inch oval, about ⅛ inch thick.

Heat about 2 cups neutral oil in a small deep pot to 350°F (175°C). Fry each dough oval for 2 to 3 minutes, folding it in half within the first 30 seconds to form a shell shape. Turn once and fry until golden brown. Drain on paper towels.

Fill each warm shell with seasoned beef, sour cream, cheddar cheese, lettuce, tomato, and Mexican blend cheese, and serve immediately.