Cheesy Oven Baked Tacos

Bahan-bahan (6 porsi)

• 1 pound lean ground beef
• 1 ounce taco seasoning (1 packet, or 2 tablespoons homemade taco seasoning)
• 1 onion (diced)
• 10 ounces canned diced tomatoes with chilies (such as Rotel)
• 12 to 14 taco shells
• 2 ½ cups shredded cheddar cheese blend (divided)
• toppings as desired (see notes)