Preheat broiler or oven to 250 degrees.
Spread torn bread on a sheet pan and dry in the oven for 45 minutes. If you are like me, and wanted it done quicker, toast under the broiler for 4 minutes!
In a large skillet, heat oil and butter over medium heat. Add the sliced minced garlic, zucchini and squash and saute until golden brown. Approximately 15 minutes. Transfer to a plate to cool.
Grease a 9 x 13 inch baking dish with butter or a non-stick cooking spray. Set aside.
In a seperate bowl whisk together the eggs, milk and salt/pepper until smooth.
Pour egg mixture over the zucchini and bread mixture. Stir until the bread is well coated. Then added the shredded cheddar and Fontina cheese and mix until well distributed. Spoon mixture into the prepared baking dish. Sprinkler shredded Parmesan cheese over the top! Cover lightly with plastic wrap and refrigerate for 1 hour or overnight.
Preheat oven to 350 degrees.
Remove plastic wrap and bake the strata until the casserole is set and the top is nicely browned. 35 to 40 minutes.
Sprinkle with parsley and serve hot! It is amazing!
Store in an airtight container in the refrigerator for upto 3 days.