Roasted Sweet Potatoes with Teriyaki and Cilantro

This was a super-simple recipe that I made in March.  It was tasty - nothing that blew my mind, but I'd make it again.

Roasted Sweet Potatoes with Teriyaki and Cilantro

6 T (about 1/3 cup) teriyaki sauce (San-J Teriyaki sauce is gluten-free)
3 large sweet potatoes, peeled and cut into ½-in. chunks
6 T (about 1/3 cup) fresh cilantro
pepper to taste

Preheat oven to 400. Coat a baking sheet with aluminum foil, and then coat that with cooking spray. Whisk teriyaki sauce and cilantro together in a bowl. Add sweet potatoes and stir. Put mixture on baking sheet and cook 35-40 minutes, stirring every few min.