Microwave your cream in 30-second bursts until it’s just bubbling. Watch carefully, as you don’t want it to bubble too much.
Stir in the culinary lavender buds, cover, and steep for 10–15 minutes. (I went with the full 15 and thought it was delicious, but if you’re a little unsure about the lavender flavor, you can go for less).
Strain out the lavender and keep the cream. I like to press the lavender into the strainer with the back of a spoon to try to squeeze out that last little bit of lavender flavor.
Add 2-3 tablespoons of lavender-infused cream to the white chocolate. Microwave them together in 20-second bursts and stir in between.
Keep stirring until you get a thick ganache (adjust the texture with more cream if you need to), and then add in purple food coloring, if using.
Let the ganache thicken for 5 minutes so it’s ideal for dipping.
Dip half of each cooled cookie into the lavender ganache and place on parchment paper. If you’d like, sprinkle a tiny bit of crushed lavender or a dusting of matcha over the top before the chocolate sets.
Let the dipped cookies set at room temperature, or chill them briefly in the fridge to speed things up.
Store them in an airtight container in the fridge.