Begin by soaking the fruity pebbles in the milk for 30-60 minutes. Strain the cereal out of the milk and set aside. You should have about 1 cup of milk but it doesn't have to be super accurate because we're adding in the cereal too.
3/4 cup (45g) fruity pebbles cereal, 1 1/2 cups (355mL) whole milk
Preheat the oven to 350F/177C convection (325F/163C conventional) and grease and line three 6 inch cake pans.
In a medium bowl, whisk together the flour, salt, and baking powder until they're evenly distributed.
2 cups (240g) all-purpose flour, 1/2 tsp salt, 1 Tbsp baking powder
In the bowl of an electric mixer fitted with the whisk attachment, beat the granulated sugar and butter for 2 minutes. Add the oil and continue beating for a minute. Add the eggs, one at a time, beating on medium speed until each egg is fully incorporated. Add the vanilla, lemon and strawberry extracts and beat just until combined.
1 1/2 cups (300g) granulated sugar, 1/4 cup (56g) unsalted butter, 1/2 cup (118mL) canola oil, 3 large eggs, 1 tsp vanilla extract, 1/2 tsp lemon extract, 1/2 tsp strawberry extract
Add half of the dry ingredients to the wet ingredients, turn the mixer on low speed and then pour in the cereal milk, followed by the rest of the dry ingredients. When the flour is almost fully combined, add in the soaked fruity pebbles and fold the batter until they're evenly distributed.
Distribute the batter evenly among the prepared pans, about 15oz in each pan and bake the cakes for 35-40 minutes. When the cake is fully baked it will release itself from the edge of the pan and it will spring back when you press down on the center.
Invert the cakes onto a tea towel and allow them to cool completely before frosting.