I live in Irving (which IS Las Colonas btw, it's stupid but they just call N Irving Las Colinas....it's not actually it's own city) & happen to be a goodie as well. I'll give you a Run down on my family's favs for brunch.
There's Le Peep off oconnor & 114, it's strictly bfast, brunch & lunch.
Then in Irving we have two contenders: Potz, off pioneer & Irving blvd which has this AMAZING deep fried French toast that is totally worth the calories, they also have things like pork chop bfasts which my hubs is a fan of.
& Joe's....we go here at least once a week & the waitresses know my three girls names by heart. Pretty much EVERYTHING there is great.
& if your looking to spend a little more but want absolutely fantastic food, go to The RANCH off MacArthur & 114. It's about $30 a plate for their buffet but they have these amazing foods like honey glazed salmon & wild boar, steaks fresh off the cows on the backyard & the most fantastic quail.... Just look up their website. I've only been to their brunch on mothers & fathers day so I'm not 100% they have it all the time but it's worth looking into. We're going again next weekend for fathers day haha