Thaw and drain spinach well. In medium sized bowl, beat 1 egg well; add half mashed potatoes, 1/2 cup of grated cheese, and chopped spinach. Combine well. Season with salt and pepper.

Soak matzas in shallow pan of warm water for about 3 minutes. Place matzas between 2 towels to absorb excess water.

Grease 9 x 9- inch baking pan or pie plate with 1 tablespoon oil. Heat the pan in preheated 350 degree Fahrenheit oven. Carefully line bottom an sides of hot pan with some of the matzah. Spread spinach filling evenly over the matzah. Cover the filling with remaining matzah. In small bowl, beat the remaining 2 eggs; add the remaining potatoes, cheese and oil. Blend well. Spread this over matza. Score top with a fork. Bake for 1 hour or until top is lightly browned.