Preheat oven to 350°F. Grease a 9 x 13-inch baking dish.
Add the crackers to the food processor and pulse until crushed. Pour the crumbs into a medium-sized bowl. Melt 3 tablespoons of butter, pour it over the crushed crackers, and stir to coat.
Then, place the zucchini chunks in the processor and process until coarsely chopped.
Remove the zucchini to another bowl and add the onions and jalapenos to the food processor. Process until finely chopped.
In a large skillet, melt 3 tablespoons of butter. Add the chopped onion, jalapenos, and zucchini. Cook until wilted and tender. Remove from the heat and stir in the green chiles and cheese until blended.
Blend the eggs, cream, salt, and pepper in the food processor until well mixed. Pour the egg mixture into the skillet. Stir well. Pour into the prepared baking dish.
Sprinkle the buttered cracker crumbs evenly over the casserole. Bake for 30 minutes until golden brown and set.