Preheat the oven to 350 F. Line two cookie sheets with parchment paper and lightly spray with cooking spray.: Warmth from the oven gives the dough immediate lift, and the smell of wheat and toasting sugars begins to build as soon as heat is present. When the oven reaches 350 F , you will notice a steady, even heat, and that reliable environment helps cookies bake evenly. Lining two cookie sheets with parchment paper prevents sticking and ensures easy transfer, and a light spray adds extra insurance against adhesion. A typical mistake at this stage is skipping the preheat or baking on an oven that is not at temperature, which leads to uneven spread and denser cookies; always let the oven fully come to temp before putting trays in. Visual cues include a faintly warmed cookie sheet when you touch it briefly with an oven mitt and a consistent oven indicator light. If your oven runs hot or cool, consider using an oven thermometer for accuracy.
In a large mixing bowl, combine the flour, baking soda and salt and stir to blend.: Right away you will notice the dry ingredients forming a uniform pale mixture, and stirring them together distributes the baking soda evenly so pockets of lift do not create odd rises. The texture should be light and free of clumps, which is important because uneven distribution can produce inconsistent texture in the baked cookie. Use a whisk or fork to aerate and blend; the sound is a soft, dry rustle as the ingredients mingle. A common error is dumping wet into dry without pre mixing, which can cause streaks of unreacted leavening; mixing first prevents that. If you see lumps of flour, sift or break them up with your fingers for a smoother dough.
In another bowl, whisk the sugars, oil, egg, applesauce and vanilla together until light and fluffy.: As you whisk the granulated sugar , brown sugar , coconut oil , egg , apple sauce , and vanilla , you will feel the mixture thicken slightly and see air bubbles form, which contributes to texture and subtle lift. The aroma shifts to a richer, sweeter scent with citrus and vanilla notes mingling. Whisking until light and fluffy usually takes a few minutes by hand and creates a glossy, cohesive batter base. Avoid overbeating, which can incorporate too much air and change texture; stop when the mixture is smooth and homogenous. The noise is a faint rhythmic clink of whisk in bowl, and visually the color becomes a shade lighter. If the oil was too hot when mixed, it can partially cook the egg , so ensure it is just melted and not hot.
Whisk the dry ingredients into the wet ingredients in two additions until the batter is very well blended. If the batter looks more 'crumbly' than smooth, add just a drop of water at a time (ONLY if needed) until it smooths out.: Start by adding about half of the dry mix, whisking gently to incorporate; then add the remainder and mix until there are no streaks of flour. The dough should come together into a slightly tacky mass that holds when scooped, not runny or overly stiff. As you fold the ingredients, you will notice a shift in texture from glossy to a softer, drier dough; this is normal. If the dough appears crumbly, a tiny amount of water can bring it together, but use restraint to avoid thinning the dough too much. Overmixing at this point can develop gluten and make cookies tough, so use gentle, deliberate strokes. A common mistake is adding too much liquid too quickly, which makes cookies spread more than intended; instead, add water sparingly and observe the feel between additions.
Fold in chocolate chips. Drop by level tablespoons about 1 inch apart onto the prepared baking sheets.: When you fold in the chocolate chips , you will hear a soft, satisfying scrape as the chips are incorporated and see the dough decorated with dark flecks. Folding rather than vigorous stirring preserves the dough structure, ensuring chewiness and preventing the chips from melting into the batter prematurely. Aim for even distribution so each cookie gets a pleasing amount of chocolate, and use a spatula to gently turn the dough over itself until chips are scattered throughout. A common misstep is overmixing at this stage, which can warm the dough and cause chips to clump; work quickly and deliberately. Visually, the dough should be studded and cohesive, ready to be portioned.
Bake 8 to 10 minutes. Remove from the oven, top with sea salt if using, and let them stand 5 minutes before removing the cookies from the pans to cool on wire racks.: As you portion the dough, you'll notice each scoop holds its shape fairly well, with slight rounding at the top. Placing them about 1 inch apart accounts for minimal spread in this recipe and helps them bake evenly. The tactile cue is a slightly tacky exterior that smooths when you press the back of the spoon lightly. A tip to keep batches consistent is to use a measuring spoon or small scoop so cookies bake at the same rate. Common mistakes include placing dough too close together, which yields merged cookies, or too far apart, which wastes space and may alter baking time slightly.
Bake 8 to 10 minutes. Remove from the oven, top with sea salt if using, and let them stand 5 minutes before removing the cookies from the pans to cool on wire racks: During baking you will see the edges take on a light golden tone and the centers appear set but still soft; the aroma transitions to warm caramel and toasted sugar notes. The 8 to 10 minutes window is crucial because it preserves a tender center while establishing a slight crisp at the perimeter. When you take the trays out, the cookies will still look a little underdone in the middle, which is perfect because they continue to set as they rest. Sprinkle with sea salt if desired to enhance contrast. Letting them stand for 5 minutes before transferring prevents breakage and allows internal steam to finish the bake. Avoid leaving them on the hot tray too long, which can cause overbrowning; move them to wire racks for even cooling. A common error is overbaking, which yields dry, hard cookies, so watch the edges closely and err on the side of slightly soft centers.