Preheat the oven to 350°F. Line baking sheets with parchment paper or a non- stick mat.
In a medium bowl, stir together the tahini, honey, vanilla, and cinnamon. Mix in the oats until well blended.
Wet hands and divide dough into small balls. Roll each ball in sesame seeds to coat then press each cookie to slightly flatten. The cookies should be about one inch in diameter.
Bake until the edges are slightly browned, about 10 minutes. Cool on the baking sheet for several minutes before removing to wire racks to cool completely.