"Teaspoon chili" refers to a small amount of chili seasoning, about the size of a teaspoon, which is used to add some spicy flavor to a dish. Full definition
Mix the remaining 1/3 cup breadcrumbs, oil and the remaining 1/2 teaspoon chili powder in a small bowl until the breadcrumbs are coated with oil. (eatingwell.com)
I only used 1 scant teaspoon chili flakes but they are really really hot. (whereismyspoon.co)
Add cumin, paprika, salt and remaining 1 teaspoon chili powder; cook 1 to 2 minutes more or until spices are fragrant. (bushbeans.com)