Preheat the oven: 160 Degree or 320 Fahrenheit For the Filling: Combine the Mascarpone (Quark or Cream Cheese) with the Eggs, Sugar, Vanilla Extract and Lemon Juice in a Bowl and Mix until smooth. Set aside For the Bottom: Place your Graham Crackers in a Zip-lock or plastic bag and crush with a rolling pin until only Crums are left (Great activity for Kids!). Melt the Butter and combine the crums, melted butter and sugar in a mixing bowl. Stir until combined - still crumbly but not soggy. Line a mini muffin tins with muffin liners and place a heaping teaspoon full of crums into the liners. With a spoon, or coin-sized tool (I use old film boxes), flatten out the crum base. Pour your cream cheese filling with a tablespoon onto the flattened base. Fill up to the rhim (the batter won't rise) Bake in oven for 15-20 minutes or until air bubbles show on the surface. No browning will show!