Some sources describe tarta de huevos as a sort of cross between a pancake and an omelette, with the addition of flour, and others as something like a quiche, but with additions of green pepper and tomato. One source describes a meat or fish pie with an egg crust.
Vegetable tart often made with layers of puréed greens such as spinach, perhaps with potatoes, and topped with grated cheese before baking.