If you want really easy, and very chocolaty, try this: Hershey's Perfectly Chocolate Cake . . .
This is EXTREMELY easy, fast, chocolaty and delicious. Check out the reviews at the link below--I agree with them. I was amazed at how easy and good it was!
Simple for beginners and easy for those with experience and wonderfully tasty for everyone.
Hershey's Perfectly Chocolate Cake
2 cups sugar
1-3/4 cups all-purpose flour
3/4 cup HERSHEY'S Cocoa
1-1/2 teaspoons baking powder
1-1/2 teaspoons baking soda
1 teaspoon salt
2 eggs
1 cup milk
1/2 cup vegetable oil
2 teaspoons vanilla extract
1 cup boiling water
1. Heat oven to 350°F. Grease and flour two 9-inch round baking pans.
2. Stir together sugar, flour, cocoa, baking powder, baking soda and salt in large bowl. Add eggs, milk, oil and vanilla; beat on medium speed of mixer 2 minutes. Stir in boiling water (batter will be thin). Pour batter into prepared pans.
3. Bake 30 to 35 minutes or until wooden pick inserted in center comes out clean. Cool 10 minutes; remove from pans to wire racks. Cool completely. Frost with "PERFECTLY CHOCOLATE" CHOCOLATE FROSTING. Makes 12 servings.
VARIATIONS:
ONE-PAN CAKE: Grease and flour 13x9x2-inch baking pan. Heat oven to 350° F. Pour batter into prepared pan. Bake 35 to 40 minutes. Cool completely. Frost.
THREE LAYER CAKE: Grease and flour three 8-inch round baking pans. Heat oven to 350°F. Pour batter into prepared pans. Bake 30 to 35 minutes. Cool 10 minutes; remove from pans to wire racks. Cool completely. Frost.
BUNDT CAKE: Grease and flour 12-cup fluted tube pan. Heat oven to 350°F. Pour batter into prepared pan. Bake 50 to 55 minutes. Cool 15 minutes; remove from pan to wire rack. Cool completely. Frost.
CUPCAKES: Line muffin cups (2-1/2 inches in diameter) with paper bake cups. Heat oven to 350°F. Fill cups 2/3 full with batter. Bake 22 to 25 minutes. Cool completely. Frost. About 30 cupcakes.
https://www.hersheys.com/recipes/en_US/recipes/184/hersheys_perfectly_chocolate_chocolate_cake.html