Cut bread slices in half diagonally, and arrange around edge of 9-inch pie plate.
In a medium skillet, melt butter and saute zucchini until tender, about 3-5 minutes.
Add tomato and oregano, and cook for 3 minutes. Stir in the flour, and spoon mixture into center of the bread-lined pie plate.
In a bowl, mix the cottage cheese, eggs, yogurt, and 1/2 the Parmesan cheese. Spoon this mixture over the vegetables in the pie plate, and sprinkle with remaining Parmesan cheese.
Bake 30 minutes in the preheated oven, until firm in center.