Begin by preheating your oven by following the baking instructions on the croissant dough package, usually around 375 degrees F.
Then, spray the heart shapes of your silicone pan with cooking spray and set aside.
Roll out the croissant dough and gently press on any perforated lines to seal the dough together.
Cut the dough into squares about 3x3 inches in size (or, larger/smaller depending on the size of the heart shapes in your pan).
Place a dough square into each section of the silicone pan, leaving enough overhang to seal the
edges later.
Add a spoonful of tomato sauce into the center of each heart, then sprinkle a generous amount of shredded cheese on top.
Fold the overhanging dough over the fillings, pinching the edges to seal.
Place the silicone pan on a baking sheet for stability, and bake for about 12-14 miniutes, or until the dough is golden brown and flaky.
Allow the heart-shaped croissant pizzas to cool slightly before serving. Enjoy!