Position a rack in the middle of the oven and preheat the oven to 325°F (160°C). Line a large baking sheet with parchment paper.
Whisk together the flour, salt, ginger, cinnamon, and nutmeg in a medium bowl.
Put the butter in the bowl of an electric mixer fitted with the paddle attachment and beat on medium-high speed until smooth. Gradually add the confectioners' sugar and continue beating until light and fluffy. Incorporate the cream and lemon extract, mixing until smooth. Reduce the mixing speed to low and gradually add the flour mixture, mixing just until the dough comes together. (The dough should form a fairly moist clump when you squeeze a bit in your hand. If it seems too crumbly, mix in additional cream, about 1 teaspoon at a time, until you're satisfied.)
Turn the dough out onto a flat work surface and shape into a cylinder about 3 inches in diameter. Divide the dough into quarters. Divide each piece into quarters again, and then cut each of those pieces in half, creating 32 pieces. Roll the pieces into balls and arrange them on the prepared baking sheet about 1 1/2 inches apart. (The butter drops expand slightly during baking.) Press the balls lightly so they stay put and don't roll around on the sheet.
Bake the butter drops for about 20 minutes, or until they are very light golden brown. Cool the butter drops on the baking sheets set on wire racks for about 2 minutes before removing them to the racks to cool completely. (You can store the butter drops at this point in airtight containers for up to 5 days, or proceed to coat them with glaze.)