Heat vegetable oil in a large cast iron skillet over medium high heat. Add ground beef and cook until browned, about 3-5 minutes, making sure to crumble the beef as it cooks; drain excess fat.

Add onion, and cook, stirring frequently, until translucent, about 2-3 minutes.

Stir in garlic until fragrant, about 1 minute.

Stir in taco seasoning, water or beer and hot sauce until flavors have blended, about 2-3 minutes.

Preheat oven to 375 degrees F. Lightly oil a 9 x 13 baking dish or coat with nonstick spray.

Place taco shells in a single layer, standing up, into the prepared baking dish. Place into oven and bake until crispy, about 3-4 minutes.

Working carefully, add 1/4 cup ground beef mixture to each taco shell; sprinkle with cheese.

Place into oven and bake until cheese has melted, about 4-5 minutes.

Serve immediately with desired toppings.