In a mug, add espresso or dark roast coffee. (For iced latte: set aside espresso to chill or use cold brew coffee. Then add to a mason jar or glass and add ice halfway.)
Add ½ - 1 tbsp of lavender simple syrup, leaving a small amount left. Slightly stir the syrup into espresso or coffee.
Add oat milk to the frother and froth the milk until foamy. Pour the oat milk into the glass, being careful, but do not stir.
Drizzle a little lavender simple syrup on top for taste, then add some lavender sprigs for garnish. Enjoy!