Preheat oven to 450°.
Arrange fennel on a baking sheet coated with cooking spray, and sprinkle evenly with 1/4 teaspoon salt. Bake at 450° for 40 minutes or until fennel is crisp-tender, stirring occasionally.
Reduce oven temperature to 375°.
Combine fennel, remaining 1/4 teaspoon salt, and the Homemade Ricotta Cheese, tossing well. Divide mixture evenly among 6 (4-ounce) gratin dishes or ramekins coated with cooking spray.
Place bread in a food processor; pulse 10 times or until coarse crumbs measure 3/4 cup. Combine breadcrumbs, tarragon, and pepper, tossing well. Sprinkle about 2 tablespoons breadcrumb mixture over each gratin dish. Bake at 375° for 20 minutes or until golden.