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Lazy daisy oatmeal cake features a brilliant broiled topping unlike anything you've likely had before. Folks will enjoy this surprising old-fashioned cake more than many other desserts.
Gather all ingredients.
Prepare the Cake: Preheat oven to 350°F. Grease (with shortening) and flour a 13- x 9-inch broiler-safe baking pan.
Stir together boiling water and rolled oats in a small heatproof bowl; let stand until room temperature, about 30 minutes, stirring occasionally to soften oats.
Meanwhile, whisk together flour, baking soda, cinnamon, nutmeg, and salt in a medium bowl. Beat butter, granulated sugar, brown sugar, and vanilla in bowl of a stand mixer fitted with a paddle attachment on high speed until light and fluffy, 3 to 4 minutes. Add eggs, 1 at a time, beating well after each addition. Add flour mixture in 2 additions, beating on low speed until just combined. Beat in oatmeal mixture on low speed until just combined.
Scrape bowl, and stir well with a rubber spatula. Pour batter into prepared pan. Bake in preheated oven until a wooden pick inserted into center comes out clean, 30 to 35 minutes. Cool in pan on a wire rack 10 minutes. (The cake should be warm, but not hot when topping is added.) Increase oven temperature to broil.
While the cake cools, prepare the Topping: Bring butter, brown sugar, and milk to a simmer in a medium saucepan over medium-high, stirring to melt butter. Cook, stirring constantly, 1 minute. Remove from heat, and stir in coconut and nuts.
Immediately spread topping over warm cake. Broil on center rack in preheated oven until topping bubbles and begins to brown, 2 to 3 minutes. (Watch cake carefully to avoid scorching.) Cool cake to room temperature, about 1 hour. Store at room temperature an airtight container or wrapped in plastic wrap up to 4 days.