In a bowl, combine first 5 ingredients. Add butter and vanilla; stir until crumbly. Set aside 1 cup. Press remaining crumb mixture evenly into an ungreased 13-in. x 9-in. baking pan. Spread preserves over crust. Combine coconut and reserved crumb mixture; sprinkle over preserves.
Bake at 350° until coconut is lightly browned, 25-30 minutes. Cool.
Test Kitchen Tips
Quaker Oats featured its first oatmeal cookie recipe on the package in 1908, more than 30 years after the company’s founding. The recipe used just three ingredients: oats, butter and eggs. Fancier ingredients, such as sugar, vanilla, cinnamon, raisins, nuts and chocolate chips, were added to later recipes.
Unless otherwise specified, Taste of Home recipes are tested with lightly salted butter. Unsalted, or sweet, butter is sometimes used to achieve a buttery flavor, such as in shortbread cookies or buttercream frosting. In these recipes, added salt would detract from the buttery taste desired.