I tried Taco Bell's new coffee chillers and shakes, and some are nearly as good as Starbucks' Frappuccinos for about 30% less

Nancy Luna, Business Insider correspondent, reviews Taco Bell's new frozen iced coffee chillers and shakes.Business Insider/Taco Bell

• Taco Bell is testing frozen iced coffee beverages and shakes.
• The two-store test in California comes as McDonald's launches the beverage-focused CosMc's.

Cold fast food beverages are hot these days, and the latest chain to play in the space is Taco Bell.

The Mexican-inspired fast food chain is testing uber-sweet iced coffee drinks and shakes, dubbed chillers, at two Southern California restaurants.

Taco Bell enters a category led by Starbucks. Soda and coffee-focused chains like Swig and 7 Brews are growing fast. And even McDonald's is getting into the trend with CosMc's, its new beverage-focused concept.

In mid-December, Taco Bell began serving three different blended iced coffee chillers in Mission Viejo, California. And a Taco Bell in Irvine, California, is testing four shakes sprinkled with tiny bits of churro crumbles.

The seven frozen drinks are topped with a thick cold foam – a popular add-on for many Starbucks drinks.

I tried the new drinks to see if they'd be worthy of a nationwide rollout.

Here's what I discovered.