Fool-Proof Grilled Skinless/Boneless Chicken Thigh Recipe, Please

Hi,

I need to make dinner for a dozen family members visiting from all over and, since we have at least two strict vegetarians, my initial thought was to just order a large tray of amazing spinach enchiladas that a local restaurant makes and then make a grilled vegetable salad, black beans, some guacamole, and maybe a quinoa pilaf to accompany.

Now it turns out some of the guests are on paleo diets, so I thought I’d keep the existing menu, switch to a cauliflower rice pilaf, and try grilling some marinated boneless, skinless chicken thighs. I figured chicken thighs are always pretty forgiving.

I’m a solid cook but have little grilling experience. Does anyone have a really delicious, relatively fool-proof boneless chicken thigh recipe with Southwestern/Mexican flavors? Ideally it would be something I could stick in the marinade the day before and grill before dinner.

Thank you!