To make the graham cracker crust, pour the crushed graham crackers into a bowl with the brown sugar and salt. Pour melted over and mix until fully combined.
Pour the crust onto greased 8x8 baking dish and spread out in an even layer. Firmly press down the crust. Bake for 10 minutes and remove from oven until the mango custard is ready to go in.
To make the mango custard, whisk the mango purée, lime juice, honey and eggs together. Sift in the flour. Mix until fully combined. Pour the custard into the crust. Bake 25-33 minutes or until the mango has firmed up.
Let cool and then place in the fridge for 1-2 hours. The bars should be cold when ready to serve. Store in refrigerator for about 3 days. Enjoy!