With their vibrant colors and lacy frills, dainty, crisp-crusted French macarons  are the perfect Valentine's Day baking project. But these lovely little delicacies are temperamental enough to stump even the most accomplished chefs. Even if you follow a detailed recipe down to the letter, a batch of macarons can go very wrong very quickly. Thanks to humidity, an unreliable oven temperature gauge, or an overly enthusiastic stirring hand, you may find yourself facing macaron-ageddon rather than baking bliss. But before you throw in the tea towel, we've assembled a few tips to solve your sugary conundrums.
Use Aged Egg Whites
Aging the egg whites dehydrates them, resulting in a firmer, more stable meringue. Place your egg whites in a plastic wrap-covered, nonporous bowl, and poke a few holes in the plastic with a toothpick. Leave the bowl in the refrigerator for up to three days. Be sure to bring the egg whites back to room temperature before using.
Use the Freshest Ingredients
A recipe calling for aged eggs does not mean that you should use eggs past their expiration date! Buy only the freshest ingredients including almond meal: old almond meal causes a macaron to lose its glossy luster.
Source: Flickr User woodleywonderworks 
Back to the Grind
Your almond meal should be very finely ground so that it fits through a mesh sieve. If you're using packaged almond meal that appears too coarse to sift, give it a good grind in a food processor to break apart any larger pieces.
Gel With Your Color
Liquid food coloring can alter the texture of your macarons, making your batter too runny. I use gel color  and add it while whipping the meringue. Don't be afraid to use a little too much: incorporating the almond meal mixture slightly diminishes the potency of the color.
Don't Sweat the Technique
Every baker has an opinion about the best way to create the perfect macaron batter, a process known as macaronnage. The idea is to press out just enough air from the batter so that it runs off your spatula thickly, slowly, but consistently. I like to gently fold the dry ingredients into the meringue, scooping from the sides, and then "punch" the center of the batter with my spatula. Others prefer pressing the batter into the side of the bowl. Find what works best for you.
If you find that the tops of your macarons are cracking in the oven, allow your piped macarons ample time to dry with the next batch. This can take upwards of 30 minutes to an hour, depending on the humidity of the room. You'll know they are adequately dried when you dab the tops with your finger and nothing sticks.
I learned this the hard way when one day I couldn't get my macarons to fully dry and I realized that it had just started raining that morning. If it's very humid, use a dehumidifier or wait to bake on a not-so-muggy day.
Source: Flickr User teresaphillips1965 
Hot and Bothered
Forgo the unreliable temperature gauge in your oven and get a trusty oven thermometer  instead.
A Crackling Shame
If you sufficiently dry your piped macarons but find that they still crack while baking, your oven may be trapping too much humidity. Try using a wooden spoon handle to prop open the oven door just a smidge for the first two minutes of baking.
Source: Flickr User Rubber Dragon 
No one gets it right the first time around. With so many variables, you will need to find the equation that works best for you, your kitchen, and your oven. Get ready for a baking adventure, but when you create the perfect, airy-light macaron, it will all be worth it!