Peel and cube potatoes. Place in Multipurpose Steamer. Cover; microwave on high 8-10 min or until cooked.
Meanwhile, drain tuna. In large bowl, whisk egg. Stir in tuna, seasoning, and peas.
Using Ground Meat Separator, mash cooked potatoes with butter. Add to tuna mixture in bowl; stir to combine.
Divide mixture into Perfect Petites; press to flatten. Bake 7-10 min or until tops are lightly browned.
Per serving (5 cakes): Calories 250, Fat 5 g (Saturated 2.5 g, Trans 0 g), Cholesterol 70 mg, Sodium 380 mg, Carbohydrate 30 g (Fiber 3 g, Sugars 3 g), Protein 20 g.
To quickly and easily fill Perfect Petites, simply dollop mixture into cavities as best you can – it’s messy! Use your finger to clean between rows, pressing overflow or messy blobs back into cavities.