My husband and I are coming to Austin March 14-17. We have dinner reservations for every night - Odd Duck, Perlas (a favorite), Mettle (personal connection). We are looking for a recommendation for brunch on Sunday. We have a car and will either hit the Blanton and Jones Contemporary or venture out to wineries so transportation/distance isn't an issue.
+1 for Green Pastures for good American fare, great shrimp cocktail (yes, it's a buffet) and some of the best bread pudding and that bourbon milk cocktail.
We too love Jack Allen's - both locations are consistently good.
Fonda San Miguel for some decent interior mexican buffet food and outrageously good desserts. Good bar service too.
I actually really like the Epicere brunch even though I'm not as keen on their dinner menu.
Their quiche is really awesome. It is nearly identical in technique to the quiche served at Thomas Keller's Bouchon.
And if that doesn't tickle your fancy, you can always cross the street to Fonda San Miguel.