All-Purpose Flour (Best Option)
1 cup all-purpose flour per 1 cup cake flourAll-purpose flour contains more protein than cake flour, which helps develop structure and thickening power in chili. The starches gelatinize during cooking, contributing to a hearty, thick consistency.
To use all-purpose flour effectively, mix it with a small amount of cold water to create a slurry before adding to the chili to avoid lumps. Cook the chili long enough to eliminate any raw flour taste.
Compared to cake flour, all-purpose flour may yield a slightly thicker and less delicate texture, but this difference is generally imperceptible in a robust dish like chili.