In a large pot, melt the butter over medium heat.
Add the onion, bell pepper, jalapeño, and a pinch of salt and cook, stirring, until soft, about 7-10 minutes.
Stir in the flour and continue cooking for another minute.
Add the milk and cook, stirring, until the mixture is thick and coats the back of a spoon.
Add the cheese, stirring until melted.
Add 2/3 cup yogurt, the cayenne, crushed red pepper, a few turns of pepper, and 1/4 teaspoon salt.
Taste and adjust seasonings as desired.
Join our mailing list to receive recipes, news, coupons, and more