HEAT oven to 350°F. BEAT eggs in large bowl until blended. ADD ricotta cheese, flour and baking powder; MIX well. STIR IN Italian cheese, ham and green onions. POUR in greased 13 x 9-inch glass baking dish.
BAKE in 350°F oven until puffed, golden and knife inserted near center comes out clean, 40 to 50 minutes. LET STAND 5 minutes.
To make ahead of time, assemble the casserole, cover tightly with aluminum foil and refrigerate overnight. Uncover and bring to room temperature before baking.
This recipe is an excellent source of choline and protein.