Heat oil in a pan or a kadai.
Splutter mustard seeds.
Add the minced garlic, ginger-garlic paste and cumin powder and saute.
Add spinach leaves, few at a time and keep stirring.
Once the leaves wilt, add eggplant cubes, turmeric powder, few green chillies, chilly powder, coriander powder and saute.
Cover and cook for about 15 mins or till the flavours blend, on a medium flame.
Add tomatoes and salt.
Cook uncovered for another 5 - 10 mins.
:- Serve with chappathis or rice.