Is Your Chili Too Spicy? Here's What To Do - Tasting Table
Briefly

To maintain that great chili flavor, instead try adding more non-spicy ingredients that your dish already contains, such as beans or vegetables. Starchy ingredients in particular will help to prevent capsaicin from binding with your taste buds.
Depending on your chili recipe, you might find yourself in a situation where you can't just bulk up with other ingredients. In this case, you can add a whole peeled potato, which will absorb some of the spice, and simply remove it before serving.
Another option is to serve the chili with a bland starch, such as rice, cornbread, or tortillas. This won't reduce the heat but allows you to balance the spice with each mouthful.
When fixing over-spiciness, adding citrus or sweeteners can work better for dishes like Thai curry, not as effective for traditional chili recipes.
Read at Tasting Table
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