Make the graham cracker dough: In a large bowl, whisk the whole wheat flour, all-purpose flour, brown sugar, baking powder, baking soda, salt, and cinnamon. Cut in the cold butter with a pastry cutter or your fingertips until the mixture looks like coarse crumbs.
Bring it together: In a small bowl, whisk honey, milk, and vanilla.
Pour over the dry mixture and stir until a shaggy dough forms. If dry, add 1–2 teaspoons milk. The dough should hold together without being sticky.
Chill: Shape the dough into a flat rectangle, wrap, and chill for 45–60 minutes.
This makes rolling easier and helps with clean edges.
Roll and cut: Preheat oven to 350°F (175°C). On a lightly floured surface or between parchment sheets, roll the dough to about 1/8 inch thick. Trim edges and cut into 2x2-inch squares (or your preferred size).
Re-roll scraps as needed.
Dock and bake: Transfer squares to two parchment-lined baking sheets. Use a fork to poke a few holes in each cracker. Bake 10–12 minutes, rotating pans halfway, until lightly golden at the edges.
Cool completely on a wire rack. They’ll crisp as they cool.
Make the filling base: In a medium bowl, beat peanut butter and softened butter until smooth. Mix in powdered sugar, salt, and vanilla.
The mixture should be thick and spreadable, not runny.
Melt the chocolate: In a heatproof bowl, microwave chocolate and cream in 20–30 second bursts, stirring between each, until smooth and glossy. Let cool 2–3 minutes so it doesn’t melt the peanut butter base.
Combine fillings: Stir the melted chocolate into the peanut butter mixture until fully blended. If it seems too soft, chill for 10–15 minutes to firm slightly.
Assemble sandwiches: Pair crackers by size.
Spread or pipe about 1–1.5 teaspoons of filling onto the underside of one cracker. Top with another and press gently until the filling reaches the edges.
Optional finishing touch: For a bakery look, roll the edges in crushed peanuts or sprinkle flaky salt on the exposed filling. Chill assembled cookies 15 minutes to set the filling.
Serve: Enjoy at room temperature for the best flavor and snap.
The chocolate-peanut butter center will be creamy but set.