Pea flakes are a popular treat for many small pets.
These come in a 70g bag. 
They are generally considered safe for:
🐹 Hamsters
🐭 Mice
🐀 Rats
🐹 Gerbils
🐹 Degus (very sparingly due to sugar/starch content)
🐰 Rabbits
🐹 Guinea pigs
🐭 Chinchillas (very sparingly) 
Feed as an occasional treat alongside  a balanced diet.