Preheat oven to 325F and grease a 9-inch ceramic or glass tart pan.
In a large bowl, whisk together the almond flour, , garlic powder and salt. Stir in butter until dough resembles coarse crumbs. Press firmly into bottom and up sides of pan and bake 15 minutes.
Remove and let cool.
Filling:
Layer zucchini in a colander and sprinkle each layer with a little salt. Let sit and drain for 30 minutes. Rinse and layer on tea towels or paper towels and pat dry.
In a large bowl, whisk together the ricotta, eggs, whipping cream, garlic, dill, salt and pepper. Stir in almost all the zucchini slices, reserving about 30 for layering on top.
Pour mixture into cooled crust. Layer remaining zucchini slices in concentric circles and sprinkle with parmesan cheese. Bake 60 to 70 minutes, or until center is no longer wobbly and a tester comes out clean.