**Preheat the Oven:** Preheat your oven to 375°F (190°C). Line a large sheet pan with aluminum foil or parchment paper for easy cleanup.

**Cook the Meat:** In a skillet over medium heat, cook the ground beef or turkey until browned and fully cooked. Drain any excess fat, then stir in the taco seasoning and water. Simmer for 3-5 minutes until thickened.

**Assemble the Tacos:** Arrange the taco shells on the prepared sheet pan. If using hard shells, lean them against each other to keep them upright. Spread a thin layer of refried beans inside each shell (optional), then spoon the seasoned meat evenly into the shells. Top each with shredded cheese.

**Bake:** Place the sheet pan in the oven and bake for 8-10 minutes, or until the cheese is melted and the taco shells are crispy.

**Add Toppings:** Remove the tacos from the oven and immediately add your desired toppings, such as shredded lettuce, diced tomatoes, and sour cream.