Preheat oven to 350°F (177°C). Lightly grease the bottom and sides of a half baking sheet (18 x 13 inch) and line with parchment paper.
Add milk to a small heavy-bottomed saucepan. Place over medium heat and warm until it barely begins to simmer. Remove from heat. Add in two of the chamomile tea bags, cover, and steep; 10 minutes. Gently press the tea bags with the back of a spoon to extract as much flavour from the tea as possible. Discard tea bags. Set aside to cool to room temperature.
In a medium bowl, whisk together the cake flour, baking powder, baking soda, and salt until well combined. Open the remaining tea bags and add the contents into the dry ingredients. Whisk well to distribute the tea evenly.
In a small bowl, whisk together yogurt, lightly beaten eggs, and pure vanilla extract until smooth.
In the bowl of a stand mixer fitted with the paddle attachment, combine the Redpath® Golden Yellow Sugar and cubed butter. Cream on medium speed until pale in colour and creamy; about 3 minutes.
Add in the dry ingredients and infused milk (room temperature), and mix on low speed until just combined. Increase speed to medium and mix until well combined; 2 minutes.
On low speed, add in a third of the yogurt mixture. Increase speed to medium and blend well until the yogurt mixture is fully incorporated into the batter. Repeat process with the remaining yogurt mixture.
Transfer the batter into the prepared baking sheet. With a large offset spatula, evenly spread the batter to the edges of the pan. Run a thumb around the edge of the baking sheet and the batter to check the depth and evenness of the batter and prevent cake from sticking to the edges.
Place cake into the preheated oven. Bake for 15 to 20 minutes, or until the cake springs back when gently pressed. Place cake onto a wire cool rack to cool completely in the pan; 2 hours.
Once cake is completely cooled, use a 3-inch round cutter to cut out as many rounds from the sheet as possible. Each mini cake will have 3 layers. Use a small offset spatula to remove excess cake from around the rounds (see Chef’s Tips).