Cream the butter, sugar and vanilla together in a large mixing bowl.
Add a little flour at a time, mixing between each addition until all the flour is combined into the mixture. The mixture will look crumbly at this time.
Carefully add in the flower petals and mix through with a fork.
Lay a sheet of cling wrap (plastic wrap) onto the counter. Carefully tip out the dough onto the wrap and shape the mixture in a log that is about 1 - 2 inches in diameter.
Wrap the plastic around the roll, and place in the fridge for at least 3 hours to harden. It is best to leave the dough overnight, though anything over 3 hours will still work.
Preheat the oven to 160˚C (325˚F) and line a baking tray with baking paper.
Remove the log from the fridge and unwrap the plastic.
Place the log onto a cutting board and cut into ¼ inch thick slices.
Lay the slices onto a lined baking tray, with enough space between them so that they are not touching.
Bake the cookies for 20 to 30 minutes, until slightly golden.
Remove from the oven.
You can leave them as they are or sprinkle with a little sugar if you like.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.