Food Network teaches how to crush, slice and mince garlic. Peel off some of the papery skin from the garlic and then smash the head of garlic with the heel of your hand to loosen the cloves; if you only need a few cloves, leave the head intact and pull some off. Separate the cloves. To peel a clove, cut away the root end with your knife. Lay the flat side of the knife over the clove while holding the knife handle, then with the heel of your free hand carefully whack the knife against the garlic to separate the skin from the clove. To crush the peeled garlic, lay the flat side of the knife over the clove and smash it again. To slice peeled garlic, lay the clove flat on the cutting board and hold it with the fingertips of one hand, keeping them curled under. Using a rocking motion with the knife, make thin slices by moving the knife slowly across the clove. To mince peeled garlic, lay the flat side of a knife over the clove and smash it. Roughly chop the clove then move your free hand flat across the tip of the knife and use a rocking motion to chop the garlic until it’s finely minced.
Preheat your oven to 375 degrees F. Butter an 8 by 8-inch casserole dish.
In a large heavy bottomed saute pan over medium heat, melt butter. Saute onion and garlic until translucent. Add zucchini and tomatoes, about 7 minutes Add thyme, and flour. Season with salt and pepper. Add mixture to the buttered casserole dish.
In a medium size bowl, add brown sugar, eggs, and half-and-half. Season with salt and pepper. Pour the milk mixture over the zucchini and sprinkle with both of the cheeses. Bake for 30 minutes.