Key Lime Cups | America's Test Kitchen

Ingredients

• 1½ graham crackers, broken into pieces
• 1 tablespoon unsalted butter
• ¼ cup (2 ounces/57 grams) cream cheese
• 1 (14-ounce) can sweetened condensed milk, opened
• 1 teaspoon grated lime zest plus ⅓ cup juice, zested and squeezed from 3 limes
• 2 tablespoons water
• 1 large egg yolk
• Pinch table salt
• Whipped cream (optional; see note, below)