Chocolate Party Cake with Dark Chocolate Ganache and Homemade Sprinkles

Preheat oven to 350°F. Brush bottom and sides of a 9-inch round cake pan with 1 3/4 to 2-inch high sides with olive oil. Line bottom of pan with a parchment paper round and lightly brush with oil.

In a large bowl, whisk together flour, cocoa, baking soda, nutmeg, and salt. In a medium bowl, whisk together eggs and sugar. Add coffee, yogurt, vanilla, and 2/3 cup olive oil and whisk until smooth. Pour wet ingredients into dry ingredients and, using a whisk, mix batter until fully combined. Switch to a rubber spatula to scrape down sides of bowl and fold the batter a few more times to fully combine until flour is fully incorporated.

Pour batter into prepared cake pan; tap cake pan once on a work surface to release any bubbles. Bake cake until a cake tester inserted into center comes out clean, 30 to 35 minutes; let cool in pan. Run a small offset spatula or a table knife around edge of pan to release cake. Invert cake onto a plate and peel off parchment paper.

Place chocolate in a medium mixing bowl; set aside. In a medium saucepan, combine cream, corn syrup, and salt; heat, stirring occasionally, until just starting to simmer and is warm to touch; pour cream mixture over chocolate and let stand for 1 minute. Whisk to create a smooth chocolate ganache; let stand at room temperature until ganache thickens into a shiny, pudding-like frosting, about 30 minutes.

When ready to serve, spread ganache over top of cake and decorate with sprinkles, if desired. Cut slices with a knife dipped in warm water and wiped dry.