Stuffed pepper soup can be made in a large stock pot instead of a slow cooker. Making stuffed pepper soup on the stove top is faster, but it may not provide the same simmering time to blend the flavors as making it in a slow cooker.
Rachael Ray has a recipe for stuffed pepper soup that takes less than 30 minutes and is cooked in a soup pot. She uses orzo rice pasta instead of traditional rice to make the recipe quicker.
Taste of Home has a recipe that uses traditional long grain rice. This recipe takes around 40 minutes to cook, but does not require a slow cooker, only a large stockpot.