Go To Grilled Chicken

Name: Go-To Grilled Chicken
Ingredients: 1 tablespoon smoked Spanish paprika; 1 teaspoon ground cumin; 1 teaspoon ground fennel; 1 teaspoon ground coriander; 1 teaspoon garlic powder (I like Penzey's roasted garlic powder); 1/2 teaspoon kosher salt (plus more, to taste, to add before grilling); 1 tablespoon Dijon or whole-grain mustard; 3 to 4 tablespoons olive oil, or enough to form a thick, spreadable paste; about 4 pounds chicken (I prefer bone-in, skin-on chicken thighs for grilling)