Prepare the ingredients. Let the butter sit at room temperature to soften. Whisk the egg with the sugar and honey until combined.
In a bowl, combine the flour, baking powder, and salt. This will be your dry mixture.
Add the whisked egg mixture, softened butter, and mashed banana to the dry ingredients. Mix well until a smooth dough forms.
Wrap the dough in plastic wrap and refrigerate for at least 30 minutes.
Once the dough has chilled, roll it out to about 5 mm (approximately 1/4 inch) thick on a lightly floured surface. Use a cookie cutter to cut out the linzer cookies. Cut out the centers of half of the shaped cookies with a smaller cookie cutter, creating the signature hole for the jam to show through.
Bake the linzer cookies in a preheated oven at 350°F (180°C) for 8-10 minutes, or until golden brown.
Once the cookies have cooled, spread the plain linzer cookies with raspberry jam. Top with the linzer cookies with the cut-out centers. Dust the assembled linzer cookies with a pinch of cinnamon, if desired.
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