1-First Step: Preparation and Mise en Place Start by preheating your oven to 350°F (175°C). This temperature is ideal for baking the cupcakes evenly without burning the edges. Line a standard 12-cup muffin tin with paper liners to prevent sticking and make cleanup easy. Before you begin mixing, ensure all your cold ingredients, specifically the butter, eggs, and cream cheese, are at room temperature. This step is crucial because room-temperature ingredients emulsify better, leading to a smoother batter and a lighter texture.

2-Second Step: Creaming the Butter and Sugar In a large mixing bowl, combine the softened unsalted butter and granulated sugar. Using a hand mixer or a stand mixer fitted with the paddle attachment, beat the mixture on medium speed. Continue this process for about 3 to 4 minutes. You want the mixture to become pale yellow and fluffy in texture. This action incorporates air into the batter, which helps the cupcakes rise and become light. Once creamed, add the eggs one at a time, beating well after each addition. Scrape down the sides of the bowl to ensure everything is evenly mixed.

3-Third Step: Adding Flavor and Liquids With the butter and sugar mixture ready, it is time to add the zesty elements. Mix in the fresh lemon zest, lemon juice, vanilla extract, and poppy seeds. The poppy seeds add a delightful crunch that contrasts nicely with the soft cake. In a separate medium bowl, whisk together the dry ingredients: the flour, baking powder, baking soda, and salt. This ensures the leavening agents are evenly distributed throughout the flour.

4-Fourth Step: Combining Wet and Dry Ingredients Now, you will combine the two mixtures. With the mixer on low speed, add the dry ingredients to the wet mixture in three parts. Alternate with the buttermilk, starting and ending with the dry ingredients. For example, add one-third of the flour mix, then half of the buttermilk, then another third of flour, the rest of the buttermilk, and finally the remaining flour. Mix only until just combined. Be careful not to overmix, as this can develop the gluten in the flour and result in dense, tough cupcakes rather than tender ones.

5-Final Step: Baking and Cooling Spoon the batter into the prepared muffin tin, filling each liner about two-thirds full. An ice cream scoop works perfectly for this to ensure uniform sizes. Bake in the preheated oven for 18 to 22 minutes. To check for doneness, insert a wooden toothpick into the center of a cupcake; if it comes out clean or with just a few moist crumbs, they are done. Let the cupcakes cool in the pan for about 5 minutes before transferring them to a wire rack to cool completely. Frosting warm cupcakes will cause the frosting to melt, so patience is key here.