I cannot price pepperoni at this time, I used a 150 gram pack of smoked ham for 90 Baht. For the Feta, that is 150 Baht for 275 grams, use half the package (75 Baht), cut the block in half and crumble that for right about a cup. Based on the Feta and smoked ham, for 4 servings, this is about $1.22 per serving.
Variants: 1. In place of pepperoni, use thin sliced smoked ham. 2. Use what you have, like a whole bell pepper instead of cup, or a package of pepperoni or smoked ham, like a cup or so, etc.
Adapted from an internet recipe.