01 -
Preheat your oven to 200°F (95°C). You'll turn it off later for the rising step.
02 -
In a large bowl or the bowl of a stand mixer, combine 3 1/2 cups flour, instant dry yeast, and salt.
03 -
In a separate heat-proof bowl, combine milk, butter, and granulated sugar. Microwave for 60-90 seconds until warm to the touch and butter is melted. Stir to combine.
04 -
Slowly add the warm milk mixture to the flour mixture, mixing with a dough hook on medium speed between additions. Add the beaten egg and mix on low until a sticky dough forms. Continue mixing on medium-low for 2-3 minutes until more elastic.
05 -
Add more flour 1 tablespoon at a time until the dough begins to leave the sides of the bowl. The dough should feel tacky but not sticky - when you poke it, no residue should stick to your finger.
06 -
Cover the bowl with plastic wrap and let the dough rest for 10 minutes to relax the gluten.
07 -
While the dough rests, mix together brown sugar, cinnamon, and cornstarch in a medium bowl. Set aside.
08 -
Generously flour your counter and roll out the dough. When halfway through rolling, sprinkle with 1/2 cup rainbow sprinkles and gently press them into the dough. Fold the dough in thirds like a letter and continue rolling into a 12×18-inch rectangle about 1/2 cm thick.
09 -
Sprinkle the remaining 1/2 cup of rainbow sprinkles on top and gently roll or press them into the dough.
10 -
Partially melt the 1/4 cup butter and pour over the dough, spreading it with a pastry brush or rubber spatula. Leave about 1/2 inch uncovered on one long edge. Spread the cinnamon-sugar filling evenly over the buttered area.
11 -
Tightly roll the dough horizontally toward the uncovered strip. Cut the log into 9 equal pieces using dental floss and place in a greased 8×8-inch square pan.
12 -
Turn off the oven completely. Cover the pan with foil and place in the warm (but off) oven for 30 minutes until the rolls have risen.
13 -
Remove the pan from the oven and take off the foil. Preheat the oven to 350°F (175°C), then bake for 26-32 minutes until rolls are golden brown.
14 -
While the rolls bake, mix butter, vanilla extract, almond extract, and salt in a medium bowl until combined. Add powdered sugar and milk, then mix until smooth.
15 -
Let the cinnamon rolls cool for 10-20 minutes, then spoon the frosting over each roll. Serve warm.