- Preheat oven to 350F (175C). Grease and flour an 8-inch round cake pan. 
- In a medium bowl, whisk together the gluten-free flour, baking powder, baking soda, and salt. 
- In a large bowl, cream together the softened butter and sugar until light and fluffy. 
- Beat in the eggs one at a time, then stir in the vanilla extract. If using food coloring, add it now. 
- Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk, beginning and ending with the dry ingredients. Mix until just combined. 
- Gently fold in the chopped strawberries. 
- Pour the batter into the prepared cake pan and spread evenly. 
- Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. 
- Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely. 
- Slice the cooled cake into even pieces. 
- Arrange the slices on freeze-dryer trays, ensuring they are not touching. 
- Freeze-dry according to the manufacturer's instructions for your freeze-dryer (typically 24-48 hours). 
- Store the freeze-dried cake slices in an airtight container to maintain crispness. 
- Tip: For a stronger strawberry flavor, add 1/2 teaspoon of strawberry extract to the batter. Almond flour can be substituted for 1/4 cup of the gluten-free flour for a slightly nutty flavor.