Creating Cheesy Taco Sticks is straightforward when you follow these steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C) to prepare for baking.
2. Cook the Meat: In a large skillet over medium heat, brown the ground beef until fully cooked. Drain any excess fat.
3. Season the Meat: Add the taco seasoning to the cooked beef and follow packet instructions for combining with water, typically adding 2/3 cup. Stir well and let simmer for about 5 minutes.
4. Add Veggies: Stir in the diced tomatoes, bell peppers, and onion into the seasoned meat, cooking for an additional 2–3 minutes until softened. Remove from heat and let the mixture cool slightly.
5. Prepare Dough: Unroll the crescent roll dough on a clean surface. Press the seams together to create a flat sheet, ensuring there are no gaps.
6. Define Sections: Cut the dough into equal rectangles, approximately 4 inches by 5 inches.
7. Fill the Dough: Spoon a portion of the taco mixture onto one side of each rectangle. Top with cheddar and mozzarella cheese.
8. Seal the Sticks: Fold the other side of the rectangle over the filling, pressing the edges firmly to seal. You can use a fork to crimp the edges for extra security.
9. Egg Wash: Beat the egg in a small bowl and brush the tops of the filled taco sticks with the egg wash for a golden finish.
10. Bake: Place the taco sticks on a baking sheet lined with parchment paper and bake in the preheated oven for 15-20 minutes or until golden brown.
11. Cool: Remove from the oven and let the Cheesy Taco Sticks cool for a few minutes before serving. This will prevent burns from the hot cheese inside.

These steps will guide you through creating some incredibly delicious Cheesy Taco Sticks effortlessly!