My favorite dinner is pepperoni pizza! that yeasty bread, sauce and cheese really make my day!
What meat is pepperoni usually made from?
I believe that Pepperoni is a form of Salami, which is cured pork.  Then it is mixed with paprika or chili powder.
That must be why it is so tasty!     Chili powder in any form is great!
Chili powder
Chili powder (also chile powder, chilli powder, or powdered chili) is the dried, pulverized fruit of one or more varieties of chili pepper, sometimes with the addition of other spices (also sometimes known as chili powder blend or chili seasoning mix). It is used as a spice to add pungency or piquancy and flavor to dishes. In American English, the name is usually spelled "chili". In British English the spelling "chilli" (with two "l"s) is used consistently.
Pepperoni
Pepperoni is an American variety of salami, made from cured pork and beef mixed together and seasoned with paprika or other chili pepper.
Pepperoni is characteristically soft, slightly smoky, and bright red in color. Thinly sliced pepperoni is a popular pizza topping in American pizzerias.
Etymology.
The term "pepperoni" is a borrowing of "peperoni", the plural of "peperone", the Italian word for bell pepper. The first use of "pepperoni" to refer to a sausage dates to 1919