01 - Preheat oven to 350°F. Grease and flour two 8-inch round cake pans. Line bottoms with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well blended.
03 - In a large bowl, beat butter and sugar on medium-high speed until light and fluffy, about 3-4 minutes.
04 - Add eggs one at a time, beating thoroughly after each addition. Mix in lemon zest and vanilla extract.
05 - In a separate measuring cup, combine lemon juice, milk, and sour cream. Stir until smooth.
06 - With mixer on low speed, alternately add flour mixture and lemon-milk mixture to butter mixture, beginning and ending with flour. Mix until just combined.
07 - Gently fold chopped strawberries into batter using a rubber spatula until evenly distributed.
08 - Divide batter evenly between prepared pans. Bake for 28-32 minutes or until a toothpick inserted into center comes out clean.
09 - Let cakes cool in pans for 10 minutes, then invert onto wire racks to cool completely before frosting.
10 - Beat butter until creamy. Add powdered sugar, lemon zest, lemon juice, salt, and 2 tablespoons cream. Beat on high speed until fluffy, 3-5 minutes, adding more cream if needed for spreading consistency.
11 - Level cooled cake tops if needed. Place one layer on serving plate, spread with buttercream, top with second layer. Frost top and sides evenly.
12 - Garnish with fresh strawberry halves and lemon slices or zest curls. Refrigerate briefly before slicing for cleaner cuts.