Place the Dijon mustard, maple syrup, rice vinegar, salt, and thyme in a blender and mix on high for a few seconds.
Keeping the blender on high, open the pour spout and slowly drizzle in the olive oil until it is fully blended.
When the dressing is emulsified, turn off the blender and put the dressing into the desired container.
Store dressing in the fridge.
Makes about 1 cup.