Preheat the oven to 340 F or 170 C.
In a bowl, add all the wet ingredients and whisk until well combined. Set aside.
In a separate bowl, add all the dry ingredients and mix until well combined.
Add the wet into the dry ingredients and whisk until well combined. The batter is thick and smooth.
Pour the batter into a 9x4 inch silicone loaf pan . This silicone loaf pan has 6 stabilizer bars which makes the pan sturdy and prevent bulging at the sides so that is why I find it so good. You can also use an 8x4 inch loaf pan or any suitable pans.
Spread evenly. As an option, spread the batter to the top of the pan for both short ends. This helps to make the top of the cake flatter so there will be less cracks. Then score a deep cut at the center of the batter. This is to limit the cracks at the middle of the cake. Butter cake has more fats so it tends to crack more easily with higher heat. However, this is just an option.
Bake at the middle rack for 45 to 50 minutes or until a wooden skewer comes out clean.
If the top is browning too fast, cover with foil.
Once ready, rest the cake upside down for 15 minutes as this will help to prevent the butter from settling at the bottom.
Meanwhile, prepare the lemon glaze. Mix the lemon juice gradually with the powdered sweetener until you get the right consistency. If too thick, add more lemon juice. If too diluted, add more powdered sweetener.
Once the cake is cooled, drizzle the lemon glaze onto the cake. Let the sides drip down naturally for a rustic look. Spread the top evenly then sprinkle with lemon zest.
Once the glaze has hardened, you can slice and enjoy.
This recipe makes about 14 to 16 servings for a standard loaf pan.
The cake can be kept at room temperature for about 2 to 3 days if you have a cool and dry climate. Otherwise, it is better to refrigerate earlier for up to a week or freeze for months.