Spinach Cheese Squares

"From the 1980 edition of The Philadelphia Orchestra Cookbook."

Ingredients

• 4 tablespoons butter, melted
• 1 teaspoon salt
• pepper, to taste
• 1 teaspoon baking powder
• 1 cup flour
• 3 eggs
• 1 cup milk
• 1 small onion, minced
• 16 ounces cheddar cheese, grated
• 2 (10 ounce) packages frozen spinach, chopped, thawed and drained
• 1 tablespoon pine nuts (optional)

Directions

1. Preheat oven to 180C/350°F.
2. Pour melted butter into 9 X 13 baking dish and swirl around to cover sides.
3. In medium bowl combine salt, pepper, baking powder and flour and set aside.
4. In large bowl, beat eggs with milk. Add flour mixture and combine thoroughly.
5. Add onion, cheese and spinach, mixing after each addition.
6. Pour mixture into baking dish and sprinkle with pine nuts, if using.