Express appetizer: these Ritz ham and cheese mini-sandwiches ready in 20 minutes conquer buffets

These mini ham and cheese sandwiches on Ritz crackers transform an ordinary appetizer into a guaranteed success. Inspired by the famous sliders, they combine ham and Swiss cheese between two salty biscuits, all topped with a secret butter, mustard, and poppy seed sauce before baking. An express 20-minute recipe that conquers all buffets and receptions.