Spinach Bites

We discovered something called a Spinach Brownie while we were in Ohio for a wedding and wine touring around Ashtabula and Geneva. I stole the idea and tweaked it a bit to make these spinach bites (just omit the bacon if you want vegetarian):

1 small package frozen spinach (thawed and drained well)
1 cup low fat Bisquick
3 eggs
1 cup skim milk
1/2 cup butter, melted
3/4 cup red onion, chopped
1 1/2 cups shredded provolone
1/2 cup cooked bacon chopped (I used cherry wood smoked bacon from the Farmer's Market)

Mix spinach, onion, eggs, milk, butter, provolone and bacon (reserve a little of the cheese and bacon to sprinkle on top).
Add Bisquick and slowly combine the ingredients
Pour into a lightly greased 9 x 13 baking dish
Bake at 375 for 30-35 minutes or until a toothpick comes out clean - add the reserved cheese and bacon after 15-20 minutes