Mix graham cracker crumbs and melted butter (if using). Press 1 tbsp into each mini muffin liner or silicone mold. Chill for 10 minutes.
Beat cream cheese, sugar, and vanilla extract until smooth and fluffy.
Spoon or pipe the cream cheese filling onto the chilled crusts.
Top each with a strawberry slice or half.
Chill bites in the fridge for 15–20 minutes before serving.
Remove from liners/molds and serve chilled.