Preheat the oven to 180 degrees Celsius.
Grease an 8x8x2 inch pan - oven-proof glass by preference.
In a medium bowl, put the complete mix and the graham crumbs and stir until well combined. Pour the mixture onto your glass pan and press until firm. Then, bake for 8 minutes.
In a medium bowl, place the softened cream cheese and a half cup of sugar. Mix with an electric mixture at low speed until smooth.
Keeping the low speed of the mixer, add one egg and the vanilla extract. Continue to mix until smooth.
Remove your crust from the oven and immediately pour your cheesecake mixture onto it.
In another medium bowl, place the lemon filling mix, the water, 3 eggs, and the other 2 teaspoons of sugar. Use a hand whisk. Pour it over the cheesecake layer.
Get your cheesecake into the oven and bake for another 40 minutes.
Remove the oven, let it cool at room temperature. Next, refrigerate for about 30 minutes to an hour. Then cut into squares or bar-sized and enjoy.