Chile powder makes chocolate thumbprint cookies taste great

Chocolate and chile powder are a master pairing because chocolate has nuanced sweetness and mild bitterness, 

Which the heat from chile powder can harmonize with and balance.

Chocolate can also sometimes feel a little rich and indulgent — this is where the chile powder comes in,

Cutting through the richness and sweetness. At the same time, chocolate's creaminess and milder flavors help mellow out and temper the heat of the chile powder.

On the food science level of why the flavor combo works so well, science has shown that eating chocolate helps your body release endorphins

On top of that, the heat and kick from chile powder also help you release endorphins; hence,

Your pleasure can double when you eat chocolate and chile powder together.