In a large bowl, combine all ingredients and mix well to combine. Dough will be quite sticky. Chill covered in refrigerator for 30-60 minutes.: The scent at this stage is intensely citrusy and slightly sweet, and you should notice the batter shining from the vegetable oil . Mixing fully creates a uniform color and small pockets of morsels throughout; you may hear the soft scrape of your spoon as dry bits fold in. Chilling firms the dough so it is manageable, and it also helps the flavors meld into a cohesive whole. One common mistake is skipping the chill, which makes portioning messy and causes excessive spreading. If your batter smells too eggy or curdled, it likely needs a bit more mixing or a touch more flour for balance. Cover the bowl tightly to prevent the lemon aroma from dissipating in the fridge.
When ready to bake, preheat oven to 375 degree F. Once oven is ready, remove cookie dough from fridge and drop by spoonfuls (approximately 1-2 tablespoons per cookie) onto a baking sheet covered with parchment paper.: You will hear the whisper of the oven fan and feel the warmth when you open the oven door, a tangible cue that the environment is ready. The chilled dough will be tacky but hold shape when scooped; the small mounds should look matte and slightly domed. Using parchment prevents sticking and promotes even browning on the bottom. A frequent error is placing dough in a cold oven, which alters baking time and texture, so always wait for the full preheat. If your cookies flatten too much, try a slightly taller scoop or a few extra minutes chilling.
Bake for 7-10 minutes or until very lightly browned.: As the cookies bake you will notice a gentle lemon perfume and the tops going from glossy to set. The edges should take on a hint of golden color while the centers remain pale and tender. Listen for a faint faint settling sound as steam escapes, and watch for the subtle color shift that signals doneness. Overbaking is the most common pitfall, producing dry cookies, so remove them while centers still look slightly soft, as they firm while cooling. If your oven runs hot, check at the earliest time and rotate the pan for even color.
Remove from oven and allow to cool completely. Store tightly covered.: Fresh from the oven the cookies will smell deeply of lemon and sweet chips, and the bottoms will have a delicate crisp. Cooling on the sheet for a short period helps stabilize shape, then transfer to a rack to cool fully; this prevents trapped steam from making the bottoms soggy. Storing airtight preserves texture and keeps the morsels from becoming chalky. A mistake to avoid is stacking warm cookies, which can cause them to stick and lose their crisp edge. If you plan to keep them longer, place parchment between layers to protect the surface and maintain the fresh bite.
