1. In a medium mixing bowl, combine flour, brown sugar, cinnamon, baking powder, baking soda, and salt.
2. Add butter and mix using a pastry cutter or fingers.
3. Add 3 tbsp water, honey, and vanilla. Stir to combine. Add more water if needed.
4. Gather dough into a ball, cover, and refrigerate for 30 minutes.
5. Preheat oven to 350°F. Prepare a 9x13" pan with parchment.
6. Spread dough in pan, sprinkle with cinnamon-sugar mixture, and poke holes with a fork.
7. Bake for 20-45 minutes. Allow to cool.
8. For marshmallow, combine sugar, corn syrup, and water in a pot. Boil and reach firm-ball stage.
9. Bloom agar-agar powder in 1/2 cup water. Combine with sugar syrup, add salt and vanilla, and whisk until fluffy.
10. Spread marshmallow over crust. Let set 2-3 hours, then broil until golden.
11. Melt chocolate in a double boiler. Coat each bar in chocolate.
12. Let bars cool and set for several hours or overnight.