You can prepare the toppings in small bowls and let everyone collect the toppings that they prefer. Put the mini pizzas together in a sauté pan or on a griddle to cook them and add the toppings later, as below.
English muffins or bagels
Pizza or Pasta sauce in a jar
Mozzarella cheese, shredded
Your choice of toppings such as sausage, pepperoni, black olives, green peppers, mushrooms, and thinly sliced tomatoes.
Put a spoonful or two of the pasta sauce on half of the bagel or English muffin. Sprinkle the garlic powder on top. Sprinkle the mozarella cheese on top of that.
Place the pizzas on a griddle or in a pan on the stove top. When the cheese starts to melt, sprinkle on the toppings that each person prefers.
When the cheese is completely melted, serve immediately.