1-First Step: Mix 2 cups flour, 1/2 cup powdered sugar, and 1/4 tsp salt in a bowl. Cut in 1 cup softened butter with a pastry blender or fork until crumbly like wet sand. This takes 2-3 minutes.

2-Second Step: Press mixture firmly into the prepared pan, covering the bottom evenly. Use the back of a measuring cup for a smooth surface. Bake at 350°F for 20-25 minutes until lightly golden. Cool for 10 minutes.

3-Third Step: Whisk 4 eggs, 2 cups sugar, 2/3 cup lemon juice, and 1 tbsp zest in a bowl until smooth. Sift in 1/4 cup flour and 1/2 tsp baking powder; whisk to combine without lumps. Pour over warm crust immediately.

4-Fourth Step: Bake at 350°F for 25-30 minutes. Edges set, center jiggles slightly. Cool at room temperature 30 minutes, then refrigerate 2 hours to firm up.

5-Fifth Step: Lift from pan using parchment. Cut into 2-inch squares. Dust with powdered sugar right before serving for that classic look.

6-Final Step: Serve chilled or at room temp. Pair with whipped cream or fresh berries. Store as noted below. These easy lemon bars from scratch impress every time.