As McDonald's seeks to modernize its business, the company is placing a big bet on mobile and other tech platforms. McDonald's has been systematically adding self-service ordering kiosks and table service to stores as it works to "build a better McDonald's." "What we're finding is when people dwell more, they select more," CEO Steve Easterbrook told CNBC on "Squawk on the Street" on Monday. "There's a little bit of an average check boost."