Earlier this week, I posed three questions for Chipotle Mexican Grill (NYSE:CMG) going into its second-quarter earnings announcement.

And wouldn't you know it? Chipotle stock popped nearly 5% in after-hours trading on Thursday after the company was kind enough to provide answers to each one.

Without further ado, here's what the popular burrito maker had to say:

1. How's the foot traffic?
First, I wanted to know whether customer traffic in Chipotle's restaurants has kept up its healthy pace. After all, much of Chipotle's weakness last year arrived when the company told investors that slowing customer traffic served as a sign for weak consumer spending in the second quarter of 2012.

This time around, however, Chipotle's was happy to report second quarter revenue, which grew 18.2% year over year to $816.8 million. This beat analysts estimates that called for $803 million, thanks both to the result of revenue from new locations, and a 5.5% increase in comparable restaurant sales. That healthy comparable sales growth was largely driven by -- you guessed it -- increased traffic during the quarter.

And for those of you keeping track, that 5.5% growth also shows a marked improvement over the last quarter's paltry 1% comparable restaurant sales increase, and even beats the pants off of Panera Bread Company's (NASDAQ:PNRA) respectable 3.3% comp-sales growth in Q1.

Of course, Panera itself is all set to report its own second-quarter earnings on July 23 and, assuming it also benefits from the same trends as Chipotle did in Q2, the competing fast-casual chain still has a chance to strut its stuff for investors next week.

Even so, the market is currently applauding Chipotle's Q2 comp sales results, especially considering they were strong enough to merit boosting their comparable sales guidance for the year. When all is said and done in 2013, Chipotle now expects "low-to-mid-single-digit" comparable sales growth, an improvement over last quarter's guidance, which called for a "flat-to-low-single-digit" increase.

2. Are food cost increases moderating?
Next, I wondered whether the cost of Chipotle's high-quality ingredients might finally show some moderation.

Remember, Chipotle has so far largely resisted raising prices of its menu items to offset the rising cost of goods, which, in turn, has taken a toll on its margins over the past year.

This quarter was no different, as restaurant level operating margin decreased 160 basis points from the year-ago period, to 27.6% during the quarter, once again primarily driven by higher food and marketing costs. Curiously enough, however, this does mark its third-straight sequential operating margin improvement, up from 26.3% last quarter, and 24.6% in the fourth quarter of 2012.

Even so, food costs in the second quarter still represented 33.1% of revenue, which is an improvement over 33.5% two quarters ago, but a slight sequential increase over last quarter's 33%, thanks again to stubbornly high commodity costs.

As a result, and when the remaining expenses were accounted for, Chipotle managed to turn in quarterly net income of $2.82 per share, an increase of just 10.1% from last year. However, that still edged out analysts' expectations, which called for earnings per share of $2.81.

3. How are those expansion plans coming along?
Last but not least, I was looking for updates to shed light on the progress of the company's expansion plans.

Sure enough, Chipotle opened 44 new restaurants during the quarter, bringing its total number of new locations this year to 92, while keeping it on track to reach the high end of its full-year restaurant openings guidance for between 165 and 180 units. As of the end of June, Chipotle now operates a total of 1,502 locations.

Unfortunately, the release didn't provide any additional color on the total growth potential for Chipotle's new Shophouse Southeast Asian Kitchen concept restaurants, but investors can at least take solace in knowing the performance of the few existing Shophouse locations has been strong enough to merit the recent signing of new lease deals last month aimed at developing four more locations.

Foolish takeaway
All in all, Chipotle shareholders should be happy that their company just wrapped up another solid quarter, and it's safe to say their company remains well positioned for significant profitable growth for the foreseeable future. 

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.