In a mixing bowl, combine flour, baking powder, and salt.
Add shortening and mix until crumbly.
Gradually add milk and knead into a soft dough.
Divide the dough into equal portions and roll into circles.
Heat oil in a pan and fry each dough circle until golden brown.
In a separate pan, cook ground beef until browned.
Add taco seasoning and water, then simmer until thickened.
Assemble chalupas by spreading ground beef onto each fried shell.
Top with lettuce, tomatoes, cheese, and sour cream.
Serve immediately and enjoy!