Prepare the Ingredients: Preheat the oven to 180°C (350°F).

Chop the onion and spinach finely.

Mix the Wet Ingredients: In a large mixing bowl, beat the eggs. Add salt, black pepper, garlic powder, oil, milk, and cream cheese. Mix until well combined.

Combine with Vegetables: Add the chopped onion and spinach to the egg mixture. Stir well to distribute evenly.

Incorporate Dry Ingredients: Gradually add the flour and baking powder to the mixture, stirring continuously until a smooth batter forms.

Prepare for Baking: Pour the batter into a greased baking dish and spread it evenly.

Place the triangular cheese slices on top of the mixture.

Bake: Bake in the preheated oven for about 25-30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.

Serve: Allow the bake to cool slightly, then cut into squares or slices. Serve warm and enjoy!