Seconding on Southern Spice. It's a little more expensive but it's totally worth it.
If you just want fast casual, there's an Indian food bar at Wholesome Choice or you can head over to Natraj's Tandoori. Natraj's has big portions and does a lot of offers for like buy 1 get 1 or a free mango lassi…
Maast Indian in Irvine and Fullerton, started off as a family business run from their house during the pandemic, now have 2 restaurants with great Indian food!