Empanada Recipe from South America

Recipe for 8:
2 lbs ground beef
2 medium onions finely diced
2 jalapeño chiles minced
1/2 tsp chili powder
2 cans (14.5 oz each) diced tomatoes
Coarse salt and ground pepper
1 cup fresh cilantro chopped
4 cups all-purpose flour plus more for dusting
2 tsp baking powder
2 tsp salt
1/2 cup cold butter cut into small pieces
1 cup cold water
1 large egg lightly beaten with 2 tbsp water

Recipe for 12:
3 lbs ground beef
3 medium onions finely diced
3 jalapeño chiles minced
1.5 cups fresh cilantro chopped
3/4 tsp chili powder
43.5 oz diced tomatoes
Course salt and ground pepper
6 cups all purpose flour plus more for dusting
1 tbsp baking powder
1 tbsp salt
3/4 cup cold butter cut into small pieces
1.5 cup cold water
1.5 egg lightly beaten with 1.5 tbsp water