If you're using graham cracker crumbs from the box, you will need 1/2 cup crumbs. After baking, let these babes cool near the oven. Crack the door and let the heat from the oven escape near the cheesecakes. In my experience, temperature extremes cause more cracks in cheesecakes than over-baking them. A gentle, even cooling situation will help you out here. When you add the egg, just stir it in with a rubber spatula or a wooden spoon. Beating the egg with the hand mixer can over-inflate the batter, causing it to puff in the oven. What comes up must come down, and often that will lead to cracks. Don't do it! Use the rest of the strawberry in a smoothie. (You can toss the strawberry remnants in a freezer bag for later smoothies, too.) If you have any leftover strawberry hearts, float them in a cocktail.