Spray a mini muffin pan with cooking spray and preheat oven to 375 degrees.: You will smell a slight scent from the oil as you spray the pan, and the pan will feel cool to the touch compared to the warm air of the oven. Getting the pan well greased prevents the bottoms from sticking, which keeps the crust intact when you remove the poppers. A common mistake is skimping on spray, leading to tearing when unmolding, so be thorough but not excessive.
Unroll crescent dough and separate into squares of 2 triangles stuck together. Take each square and press on the seam to seal it. Cut into 4 smaller squares. Between the 2 containers of crescent dough, you should get 32 pieces of dough (if I’ve done the math right). It’s ok if they’re a little misshapen.: The dough will be soft and slightly tacky when you unroll it, with a mild buttery smell. Pressing the seam to seal creates a sturdier surface that will hold the fillings, and cutting into four smaller squares gives you consistent sizes. If the dough feels too cold and resists, let it sit for a few minutes to relax so it cuts cleanly.
Press dough squares down into mini muffin cups, shaping them to fit the bottom and up the sides.: As you press the dough, you will notice it stretches and takes on the muffin cup shape, forming little cups that cradle the fillings. The edges will start to look more sealed and slightly pinched; that is normal and helps create a crisp rim. Avoid over stretching which can thin the base and lead to leaks when baking.
Using 2 spoons, place a small amount of cream cheese (maybe 1/2 teaspoon, but totally up to personal preference) into bottom of each dough-filled muffin cup.: The creamy texture will be cool and smooth as you spoon it in, and a scant half teaspoon prevents the filling from overpowering the shell. That creamy layer keeps the center rich and slows sauce from soaking the dough. Spoon too much and the center will be heavy and underbaked compared to the edges.
On top of cream cheese, spoon a little pizza sauce (maybe 1 teaspoon) into each cup.: The pizza sauce will be tangy and slightly fragrant, and a tiny spoonful adds bright tomato notes without making the dough soggy. You will see glossy red pools that sit atop the cream cheese, and the scent will become more savory. Using too much sauce leads to excess moisture and longer baking time, so stick to a small spoonful.
Top pizza sauce with a little sprinkling of oregano and mozzarella cheese. Place 3 to 4 mini pepperonis on top of each popper.: The sprinkle of dried oregano will scent the poppers subtly, and the shredded mozzarella cheese melts into a pale, creamy layer that browns lightly. The mini pepperonis will release a touch of oil and crisp at the edges, giving a textural contrast. If you crowd too many toppings the cheese may not brown evenly, so keep it modest.
Place in oven for 10 to 12 minutes, but check after 8 minutes because you definitely do not want to burn these guys.: As they bake you will see the edges of the dough turn golden, and the cheese begins to melt and bubble with tempting aroma. The sound is quiet, but you can notice a subtle hot oven hum and the smell of toasted dough. A common error is leaving them too long which dries out the base, so check early and watch for a gentle golden hue.
Let cool in pan for a minute or two, just until cool enough to handle. If reusing the pan for another batch it is best to let the pan cool before placing dough into it.: Cooling allows the fillings to settle and the crust to firm up slightly so they hold their shape when removed. You will feel steam rising and a comforting warmth when you lift the pan, and the texture will shift from molten to pleasantly warm. Attempting to remove them immediately can cause filling to spill or burn fingers, so be patient for a short minute or two.