Begin by separating the egg whites from the egg yolks into two large bowls.
Add ¾ cup of sugar to the egg yolks. Use a hand mixer to beat until pale yellow. Slowly pour in the milk and vanilla.
Add the sifted flour, baking powder, and salt to the egg yolk mixture. Mix until just combined, being careful not to overmix the batter.
In the other bowl, beat your egg whites on high speed, gradually adding 1/4 cup of sugar. Continue beating until stiff, fluffy peaks form.
Gradually fold the beaten egg whites into the light yellow mixture until the batter becomes a fluffy, light, and spongy in texture.
Pour the cake batter into a 9x13-inch baking dish. Bake for 30-35 minutes, until a toothpick inserted into the center comes out clean.
Cool the cake completely, then use a fork to poke small holes in the cake.
In a large bowl, whisk together the sweetened condensed milk, evaporated milk, and whole milk. Pour the milk mixture over the cake, spreading it evenly.
Cover the cake in plastic wrap and chill in the fridge overnight.
The next time, use a whisk attachment on a hand mixture to whisk together the heavy cream, powdered sugar, and vanilla to create a topping.
Spread the topping over your cake, decorate with strawberries and cinnamon, and serve cold.