Lemon-Lime Sheet Cake with Vanilla Frosting

Lemon-Lime Sheet Cake with Vanilla Frosting

Yield: 15 slices
Equipment: 9-by-13-inch metal pan, bowls, mixer, rack
Time and setting: 350°F; 28–34 minutes

Ingredients

• 2 1/2 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 3 large eggs
• 1 1/4 cups sugar
• 3/4 cup neutral oil
• 1 cup lemon-lime soda
• 1 teaspoon vanilla
• 1 teaspoon lime zest
• 6 tablespoons butter, softened
• 2 cups powdered sugar
• 2 tablespoons milk
• 1/2 teaspoon vanilla

Method

1. Heat oven to 350°F. Grease and line pan. Whisk flour, baking powder, and salt.
2. Beat eggs and sugar two minutes; add oil, soda, vanilla, and zest. Fold in dry ingredients.
3. Spread in pan. Bake 28–34 minutes until center reaches 160°F and tester has no wet batter. Cool fully.
4. Beat butter smooth; add powdered sugar, milk, and vanilla. Frost cake and cut 15 pieces.

Technique, cues, and troubleshooting

Use freshly opened soda so carbonation remains, but understand baking powder supplies the dependable lift. Fold gently after soda is added. A flat cake often results from expired baking powder or overmixing. The cake must be completely cool before frosting; warmth melts butter and causes sliding. Lemon zest may replace lime. Plain sparkling water can replace soda, though the cake will be less sweet; do not alter sugar simultaneously. Mark three rows by five for equal slices.

Storage and safety

Cover and store two days room temperature or four days refrigerated. Freeze unfrosted cake up to two months.

Serving and preparation

Measure portions against the stated yield and keep ingredient states exactly as listed. Prepare any optional garnish separately so it does not change the base texture. Label leftovers with the preparation date, follow the storage limit, and check packaged ingredients for allergens before serving.

Detailed preparation and serving cues

Line the long sides with parchment handles and grease the short ends. Beat eggs and sugar until slightly thickened and pale, which helps create an even crumb; once soda and flour enter, switch to gentle folding. Lemon-lime soda should be measured after foam subsides so one cup represents liquid rather than bubbles. Spread batter level into the corners. Begin checking at 28 minutes and verify both a clean tester and 160°F near the center. Cool in the pan 15 minutes, then lift to a rack. For frosting, butter should be soft but not shiny. Add powdered sugar in stages on low speed to avoid lumps and airborne sugar. If frosting is stiff, add milk one teaspoon at a time; if loose, chill briefly rather than adding large unmeasured amounts. Frost only when the cake is completely cool.

Lime zest should include only the colored outer peel; the white pith is bitter. Zest before opening the soda so the batter can be mixed promptly. Refrigerated cake tastes best after standing 15 minutes at room temperature, but return unused portions to cold storage.