Starbucks is launching a new offensive in its efforts to be all things to all coffee lovers.

The giant retailer will soon be offering its own version of a single-cup home brewing machine. Starbucks will begin selling its "Verismo" machine this fall, the company announced yesterday.

Right now, Green Mountain currently dominates the single serve market with its popular Keurig, or K-Cup machines. Last year, the two companies announced a deal allowing Green Mountain to produce K-Cup versions of Starbucks coffees and Tazo teas. That partnership may continue.

"This is complementary to our partnership with Green Mountain, and they can and they will co-exist," Starbucks CEO Howard Schultz said in a call with analysts. 

Starbucks said that it shipped over 100 million K-Cup packs in the eight weeks following last year's launch, and that the Starbucks K-Cup business "continues to accelerate."

Even the threat of new competition had shares of Green Mountain falling late Thursday.