What you need
2 cups regular flour
1 1/2 teaspoons baking powder
1 teaspoon salt
2 teaspoons cooking oil
3/4 cup warm milk
The process
Sift the flower into a large bowl with the baking powder and salt.
Add the milk and oil and mix with your hands to for a stiff dough.
Lightly flour a surface, tip the dough onto the surface and knead the dough well for 3 or 4 minutes.
Place the dough back into the bowl, cover with a clean cloth and leave it to rest for about 20 minutes or so.
Now, lightly flour a surface and separate the dough into 8 or 9 equal portions. Use a rolling pin to roll it out very thin in a circular shape.
On a medium heat, heat just enough oil to coat the base of a large pan, place the tortilla into the pan and cook until bubbles start to form, turn it over and cook for another 2 mintes or so.
Thats it, Fresh, soft delicious tortillas

Is it possible to use selfraising flour or not?
Hi V, Can’t see any reason why it won’t work.. Have fun G