Spinach Brownies

This is one of the best things that I have eaten in a long time! I promise you will NOT be disappointed! My kids gobbled them up!!!!
INGREDIENTS:
1 10oz bag fresh spinach; chopped
1 medium onion; diced
1 tbsp minced garlic
1 tbsp olive oil OR butter
4 mushrooms; diced into small chunks
3/4 cup w.w. flour
1/4 cup white flour
2 tbsp ground flax seed
1 tsp baking powder
1 1/2 tsp salt
1/2 tsp ground pepper
3 eggs
1 cup milk
4 tbsp melted butter
8oz cheese; shredded (I used both white sharp cheddar and a mexican blend)
1/2 cup sausage or bacon crumbles/chunks (optional)
Parmesan cheese to top

DIRECTIONS:
Saute onion, garlic, spinach in either oil or butter, in a large skillet until spinach is wilting. Add mushrooms and saute another 2 minutes.
Meanwhile mix together flours, flax, baking powder, salt and pepper in a small bowl.
In a medium bowl mix together eggs, milk, cheese, melted butter, and meat crumbles i(f desired). Add flour mixture to egg mixture. Then add spinach mixture and mix well. Place in a
buttered 9x13 pan and sprinkle parmesan over top. Bake at 375 for 40 minutes.